485BPOS

Registration No. 333-00201

File No. 811-07489

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	¨
Pre-Effective Amendment No. _____	¨
Post-Effective Amendment No. 31	x
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 33

Oppenheimer International Growth Fund

(Exact Name of Registrant as Specified in Charter)

6803 South Tucson Way, Centennial, Colorado    80112-3924

(Address of Principal Executive Offices)                 (Zip Code)

(303)768-3200

(Registrant’s Telephone Number, including Area Code)

Arthur S. Gabinet, Esq.

OFI Global Asset Management, Inc.

Two World Financial Center, 225 Liberty Street, New York, New York 10281-1008

(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):

x immediately upon filing pursuant to paragraph (b)

¨ on _______________ pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ on _______________ pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on _______________ pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

¨ this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

 

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all the requirements for effectiveness of this Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of New York and State of New York on the 14^th day of April, 2014.

OPPENHEIMER INTERNATIONAL GROWTH FUND
By:	William F. Glavin, Jr.*
	William F. Glavin, Jr.*, President,
	Principal Executive Officer and Trustee

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities on the dates indicated:

Signatures	Title	Date
Brian F. Wruble*	Chairman of the	April 14, 2014
Brian F. Wruble	Board of Trustees
William F. Glavin, Jr.*	President, Principal	April 14, 2014
William F. Glavin, Jr.	Executive Officer and Trustee
Brian W. Wixted*	Treasurer, Principal	April 14, 2014
Brian W. Wixted	Financial & Accounting Officer
David K. Downes*	Trustee	April 14, 2014
David K. Downes
Matthew P. Fink*	Trustee	April 14, 2014
Matthew P. Fink
Edmund P. Giambastiani, Jr.*	Trustee	April 14, 2014
Edmund P. Giambastiani, Jr.
Mary F. Miller*	Trustee	April 14, 2014
Mary F. Miller
Joel W. Motley*	Trustee	April 14, 2014
Joel W. Motley
Joanne Pace*	Trustee	April 14, 2014
Joanne Pace
Joseph M. Wikler*	Trustee	April 14, 2014
Joseph M. Wikler
Peter I. Wold*	Trustee	April 14, 2014
Peter I. Wold

*By:	/s/ Mitchell J. Lindauer
	Mitchell J. Lindauer, Attorney-in-Fact

 

EXHIBIT INDEX

Exhibit No.	Description
Ex-101.INS	XBRL Instance Document
Ex-101.SCH	XBRL Taxonomy Extension Schema Document
Ex-101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
Ex-101.DEF	XBRL Taxonomy Extension Definition Linkbase
Ex-101.LAB	XBRL Taxonomy Extension Labels Linkbase
Ex-101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Investment Objective. The Fund seeks capital appreciation.

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

Fees and Expenses of the Fund. This table describes the fees and expenses that you may pay if you buy and hold or redeem shares of the Fund. You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $25,000 in certain funds in the Oppenheimer family of funds. More information about these and other discounts is available from your financial professional and in the section "About Your Account" beginning on page 12 of the prospectus and in the sections "How to Buy Shares" beginning on page 56 and "Appendix A" in the Fund's Statement of Additional Information.

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $25,000 in certain funds in the Oppenheimer family of funds.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 25,000

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

^[1]

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

Expenses have been restated to reflect current fees.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Example. The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in a class of shares of the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your expenses would be as follows:

Expense Example by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

If shares are redeemed

Expense Example, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

If shares are not redeemed

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

Portfolio Turnover. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 12% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

12.00%

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Principal Investment Strategies. The Fund mainly invests in the common stock of growth companies that are domiciled or have their primary operations outside of the United States. It may invest 100% of its assets in securities of foreign companies. The Fund may invest in emerging markets as well as in developed markets throughout the world. From time to time it may place greater emphasis on investing in one or more particular regions such as Asia, Europe or Latin America. Under normal market conditions the Fund will:

• invest at least 65% of its total assets in common and preferred stocks of issuers in at least three different countries outside of the United States, and

• emphasize investments in common stocks of issuers that the portfolio managers consider to be "growth" companies.

The Fund does not limit its investments to issuers within a specific market capitalization range and at times may invest a substantial portion of its assets in one or more particular capitalization ranges. The Fund can also buy securities convertible into common stock and other securities having equity features. The Fund can use hedging and certain derivative instruments to seek capital appreciation or to try to manage investment risks.

In selecting investments for the Fund's portfolio, the portfolio managers evaluate investment opportunities on a company-by-company basis. The portfolio managers look primarily for foreign companies with high growth potential using a "bottom up" investment approach, that is, by looking at the investment performance of individual stocks before considering the impact of general or industry-specific economic trends. This approach includes fundamental analysis of a company's financial statements and management structure and consideration of the company's operations, product development, and industry position.

The portfolio managers currently focus on the following factors, which may vary in particular cases and may change over time:

• companies that enjoy a strong competitive position and high demand for their products or services;

• companies with accelerating earnings growth and cash flow; and

• diversity among companies, industries and countries to help reduce the risks of foreign investing, such as currency fluctuations and stock market volatility.

The portfolio managers also consider the effect of worldwide trends on the growth of particular business sectors and look for companies that may benefit from those trends. The trends currently considered include: mass affluence, new technologies, restructuring and aging. The portfolio managers do not invest any fixed amount of the Fund's assets according to these criteria and the trends that are considered may change over time. The portfolio managers monitor individual issuers for changes in the factors above, which may trigger a decision to sell a security, but does not require a decision to do so.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Principal Risks. The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Main Risks of Investing in Stock. The value of the Fund's portfolio may be affected by changes in the stock markets. Stock markets may experience significant short-term volatility and may fall sharply at times. Different stock markets may behave differently from each other and U.S. stock markets may move in the opposite direction from one or more foreign stock markets.

The prices of individual stocks generally do not all move in the same direction at the same time and a variety of factors can affect the price of a particular company's stock. These factors may include, but are not limited to: poor earnings reports, a loss of customers, litigation against the company, general unfavorable performance of the company's sector or industry, or changes in government regulations affecting the company or its industry.

Industry and Sector Focus . At times the Fund may increase the relative emphasis of its investments in a particular industry or sector. The prices of stocks of issuers in a particular industry or sector may go up and down in response to changes in economic conditions, government regulations, availability of basic resources or supplies, or other events that affect that industry or sector more than others. To the extent that the Fund increases the relative emphasis of its investments in a particular industry or sector, its share values may fluctuate in response to events affecting that industry or sector. To some extent that risk may be limited by the Fund's policy of not concentrating its investments in any one industry.

Main Risks of Foreign Investing. Foreign securities are subject to special risks. Foreign issuers are usually not subject to the same accounting and disclosure requirements that U.S. companies are subject to, which may make it difficult for the Fund to evaluate a foreign company's operations or financial condition. A change in the value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of securities denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those securities. The value of foreign investments may be affected by exchange control regulations, foreign taxes, higher transaction and other costs, delays in the settlement of transactions, changes in economic or monetary policy in the United States or abroad, expropriation or nationalization of a company's assets, or other political and economic factors. These risks may be greater for investments in developing or emerging market countries.

Eurozone Investment Risks. Certain of the regions in which the Fund invests, including the European Union (EU), currently experience significant financial difficulties. Following the recent global economic crisis, some of these countries have depended on, and may continue to be dependent on, the assistance from others such as the European Central Bank (ECB) or other governments or institutions, and failure to implement reforms as a condition of assistance could have a significant adverse effect on the value of investments in those and other European countries. In addition, countries that have adopted the euro are subject to fiscal and monetary controls that could limit the ability to implement their own economic policies, and could voluntarily abandon, or be forced out of, the euro. Such events could impact the market values of Eurozone and various other securities and currencies, cause redenomination of certain securities into less valuable local currencies, and create more volatile and illiquid markets.

Special Risks of Developing and Emerging Markets. The economies of developing or emerging market countries may be more dependent on relatively few industries that may be highly vulnerable to local and global changes. The governments of developing and emerging market countries may also be more unstable than the governments of more developed countries and those countries are more likely to experience instability resulting from rapid changes or developments in social, political and economic conditions. These countries generally have less developed securities markets or exchanges, and less developed legal and accounting systems. Securities may be more difficult to sell at an acceptable price and may be more volatile than securities in countries with more mature markets. The value of developing or emerging market currencies may fluctuate more than the currencies of countries with more mature markets. Investments in developing or emerging market countries may be subject to greater risks of government restrictions, including confiscatory taxation, expropriation or nationalization of a company's assets, restrictions on foreign ownership of local companies and restrictions on withdrawing assets from the country. Investments in securities of issuers in developing or emerging market countries may be considered speculative.

Time-Zone Arbitrage. The Fund may invest in securities of foreign issuers that are traded in U.S. or foreign markets. If the Fund invests a significant amount of its assets in foreign markets, it may be exposed to "time-zone arbitrage" attempts by investors seeking to take advantage of differences in the values of foreign securities that might result from events that occur after the close of the foreign securities market on which a security is traded and before the Fund's net asset value is calculated. If such time-zone arbitrage were successful, it might dilute the interests of other shareholders. The Fund's use of "fair value pricing" to adjust certain market prices of foreign securities may help deter those activities.

Main Risks of Growth Investing. If a growth company's earnings or stock price fails to increase as anticipated, or if its business plans do not produce the expected results, its securities may decline sharply. Growth companies may be newer or smaller companies that may experience greater stock price fluctuations and risks of loss than larger, more established companies. Newer growth companies tend to retain a large part of their earnings for research, development or investments in capital assets. Therefore, they may not pay any dividends for some time. Growth investing has gone in and out of favor during past market cycles and is likely to continue to do so. During periods when growth investing is out of favor or when markets are unstable, it may be more difficult to sell growth company securities at an acceptable price. Growth stocks may also be more volatile than other securities because of investor speculation.

Who Is The Fund Designed For? The Fund is designed primarily for investors seeking capital appreciation. Those investors should be willing to assume the greater risks of share price fluctuations that are typical for an aggressive fund focusing on growth stock investments, and the special risks of investing in both developed and emerging foreign countries. The Fund does not seek current income and is not designed for investors needing income. The Fund is not a complete investment program. You should carefully consider your own investment goals and risk tolerance before investing in the Fund.

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The Fund's Past Performance. The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance (for Class A shares) from calendar year to calendar year and by showing how the Fund's average annual returns for the periods of time shown in the table compare with those of a broad measure of market performance. The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website: https://www.oppenheimerfunds.com/fund/InternationalGrowthFund

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Sales charges and taxes are not included in the calculations and the returns would be lower if they were

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Sales charges and taxes are not included in the calculations and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 21.90% (2qtr09) and the lowest return was -19.43% (4qtr08). For the period from January 1, 2013 to December 31, 2013 the cumulative return before sales charges and taxes was 25.11%.

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns for the periods ended December 31, 2013

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

The following table shows the average annual total returns for each class of the Fund's shares. After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes. Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

https://www.oppenheimerfunds.com/fund/InternationalGrowthFund

MSCI AC World ex-U.S. Index

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

15.29%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

12.81%

10 Years

rr_AverageAnnualReturnYear10

7.57%

MSCI AC World ex-U.S. Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

11.55%

^[2]

10 Years

rr_AverageAnnualReturnYear10

5.91%

^[3]

Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.67%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.15%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

686

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

921

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,175

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,900

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

686

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

921

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,175

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,900

Annual Return 2004

rr_AnnualReturn2004

16.47%

Annual Return 2005

rr_AnnualReturn2005

14.08%

Annual Return 2006

rr_AnnualReturn2006

29.61%

Annual Return 2007

rr_AnnualReturn2007

12.38%

Annual Return 2008

rr_AnnualReturn2008

(41.51%)

Annual Return 2009

rr_AnnualReturn2009

37.78%

Annual Return 2010

rr_AnnualReturn2010

14.69%

Annual Return 2011

rr_AnnualReturn2011

(7.71%)

Annual Return 2012

rr_AnnualReturn2012

21.62%

Annual Return 2013

rr_AnnualReturn2013

25.11%

Year to Date Return, Label

rr_YearToDateReturnLabel

For the period from January 1, 2013 to December 31, 2013 the cumulative return before sales charges and taxes was 25.11%.

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

25.11%

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Dec. 31, 2013

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return for a calendar quarter was 21.90% (2qtr09)

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

21.90%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return was -19.43% (4qtr08)

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.43%)

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

1 Year

rr_AverageAnnualReturnYear01

17.92%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

15.90%

10 Years

rr_AverageAnnualReturnYear10

9.00%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 25, 1996

Class A | After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

17.54%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

15.75%

10 Years

rr_AverageAnnualReturnYear10

8.83%

Class A | After Taxes on Distributions and Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.13%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

12.89%

10 Years

rr_AverageAnnualReturnYear10

7.38%

Class B

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Management Fees

rr_ManagementFeesOverAssets

0.67%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.90%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

695

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

903

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,236

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,863

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

195

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

603

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,036

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,863

1 Year

rr_AverageAnnualReturnYear01

19.18%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

16.14%

10 Years

rr_AverageAnnualReturnYear10

9.13%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 25, 1996

Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.67%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.90%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

295

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

603

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,036

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,243

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

195

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

603

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,036

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,243

1 Year

rr_AverageAnnualReturnYear01

23.18%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

16.41%

10 Years

rr_AverageAnnualReturnYear10

8.83%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 25, 1996

Class N

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.67%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.40%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

244

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

446

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

771

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,691

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

144

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

446

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

771

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,691

1 Year

rr_AverageAnnualReturnYear01

23.79%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

16.99%

10 Years

rr_AverageAnnualReturnYear10

9.34%

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2001

Class Y

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.67%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.23%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.90%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

92

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

288

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

501

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,113

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

92

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

288

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

501

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,113

1 Year

rr_AverageAnnualReturnYear01

25.46%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

17.79%

10 Years

rr_AverageAnnualReturnYear10

9.13%

Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 07, 2005

Class I

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) imposed on purchases (as % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.67%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.04%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.71%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

73

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

228

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

396

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

886

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

73

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

228

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

396

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 886

1 Year

rr_AverageAnnualReturnYear01

25.71%

5 Years (or life of class, if less)

rr_AverageAnnualReturnYear05

19.43%

10 Years

rr_AverageAnnualReturnYear10

Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 29, 2012

[1] Expenses have been restated to reflect current fees.

[2] As of 3/31/2012

[3] As of 8/31/2005

XML

(Oppenheimer International Growth Fund)

Investment Objective. The Fund seeks capital appreciation.

Fees and Expenses of the Fund. This table describes the fees and expenses that you may pay if you buy and hold or redeem shares of the Fund. You may qualify for sales charge discounts if you (or you and your spouse) invest, or agree to invest in the future, at least $25,000 in certain funds in the Oppenheimer family of funds. More information about these and other discounts is available from your financial professional and in the section "About Your Account" beginning on page 12 of the prospectus and in the sections "How to Buy Shares" beginning on page 56 and "Appendix A" in the Fund's Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees (Oppenheimer International Growth Fund)	Class A	Class B	Class C	Class N	Class Y	Class I
Maximum Sales Charge (Load) imposed on purchases (as % of offering price)	5.75%	none	none	none	none	none
Maximum Deferred Sales Charge (Load) (as % of the lower of original offering price or redemption proceeds)	none	5.00%	1.00%	1.00%	none	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

^[1]

Annual Fund Operating Expenses (Oppenheimer International Growth Fund)	Class A	Class B	Class C	Class N	Class Y	Class I
Management Fees	0.67%	0.67%	0.67%	0.67%	0.67%	0.67%
Distribution and/or Service (12b-1) Fees	0.25%	1.00%	1.00%	0.50%	none	none
Other Expenses	0.23%	0.23%	0.23%	0.23%	0.23%	0.04%
Total Annual Fund Operating Expenses	1.15%	1.90%	1.90%	1.40%	0.90%	0.71%

Example. The following Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in a class of shares of the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your expenses would be as follows:

If shares are redeemed

Expense Example (Oppenheimer International Growth Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	686	921	1,175	1,900
Class B	695	903	1,236	1,863
Class C	295	603	1,036	2,243
Class N	244	446	771	1,691
Class Y	92	288	501	1,113
Class I	73	228	396	886

If shares are not redeemed

Expense Example, No Redemption (Oppenheimer International Growth Fund) (USD $)	1 Year	3 Years	5 Years	10 Years
Class A	686	921	1,175	1,900
Class B	195	603	1,036	1,863
Class C	195	603	1,036	2,243
Class N	144	446	771	1,691
Class Y	92	288	501	1,113
Class I	73	228	396	886

Portfolio Turnover. The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 12% of the average value of its portfolio.

Principal Investment Strategies. The Fund mainly invests in the common stock of growth companies that are domiciled or have their primary operations outside of the United States. It may invest 100% of its assets in securities of foreign companies. The Fund may invest in emerging markets as well as in developed markets throughout the world. From time to time it may place greater emphasis on investing in one or more particular regions such as Asia, Europe or Latin America. Under normal market conditions the Fund will:

• invest at least 65% of its total assets in common and preferred stocks of issuers in at least three different countries outside of the United States, and

• emphasize investments in common stocks of issuers that the portfolio managers consider to be "growth" companies.

The Fund does not limit its investments to issuers within a specific market capitalization range and at times may invest a substantial portion of its assets in one or more particular capitalization ranges. The Fund can also buy securities convertible into common stock and other securities having equity features. The Fund can use hedging and certain derivative instruments to seek capital appreciation or to try to manage investment risks.

In selecting investments for the Fund's portfolio, the portfolio managers evaluate investment opportunities on a company-by-company basis. The portfolio managers look primarily for foreign companies with high growth potential using a "bottom up" investment approach, that is, by looking at the investment performance of individual stocks before considering the impact of general or industry-specific economic trends. This approach includes fundamental analysis of a company's financial statements and management structure and consideration of the company's operations, product development, and industry position.

The portfolio managers currently focus on the following factors, which may vary in particular cases and may change over time:

• companies that enjoy a strong competitive position and high demand for their products or services;

• companies with accelerating earnings growth and cash flow; and

• diversity among companies, industries and countries to help reduce the risks of foreign investing, such as currency fluctuations and stock market volatility.

The portfolio managers also consider the effect of worldwide trends on the growth of particular business sectors and look for companies that may benefit from those trends. The trends currently considered include: mass affluence, new technologies, restructuring and aging. The portfolio managers do not invest any fixed amount of the Fund's assets according to these criteria and the trends that are considered may change over time. The portfolio managers monitor individual issuers for changes in the factors above, which may trigger a decision to sell a security, but does not require a decision to do so.

Principal Risks. The price of the Fund's shares can go up and down substantially. The value of the Fund's investments may change because of broad changes in the markets in which the Fund invests or because of poor investment selection, which could cause the Fund to underperform other funds with similar investment objectives. There is no assurance that the Fund will achieve its investment objective. When you redeem your shares, they may be worth more or less than what you paid for them. These risks mean that you can lose money by investing in the Fund.

Main Risks of Investing in Stock. The value of the Fund's portfolio may be affected by changes in the stock markets. Stock markets may experience significant short-term volatility and may fall sharply at times. Different stock markets may behave differently from each other and U.S. stock markets may move in the opposite direction from one or more foreign stock markets.

The prices of individual stocks generally do not all move in the same direction at the same time and a variety of factors can affect the price of a particular company's stock. These factors may include, but are not limited to: poor earnings reports, a loss of customers, litigation against the company, general unfavorable performance of the company's sector or industry, or changes in government regulations affecting the company or its industry.

Industry and Sector Focus . At times the Fund may increase the relative emphasis of its investments in a particular industry or sector. The prices of stocks of issuers in a particular industry or sector may go up and down in response to changes in economic conditions, government regulations, availability of basic resources or supplies, or other events that affect that industry or sector more than others. To the extent that the Fund increases the relative emphasis of its investments in a particular industry or sector, its share values may fluctuate in response to events affecting that industry or sector. To some extent that risk may be limited by the Fund's policy of not concentrating its investments in any one industry.

Main Risks of Foreign Investing. Foreign securities are subject to special risks. Foreign issuers are usually not subject to the same accounting and disclosure requirements that U.S. companies are subject to, which may make it difficult for the Fund to evaluate a foreign company's operations or financial condition. A change in the value of a foreign currency against the U.S. dollar will result in a change in the U.S. dollar value of securities denominated in that foreign currency and in the value of any income or distributions the Fund may receive on those securities. The value of foreign investments may be affected by exchange control regulations, foreign taxes, higher transaction and other costs, delays in the settlement of transactions, changes in economic or monetary policy in the United States or abroad, expropriation or nationalization of a company's assets, or other political and economic factors. These risks may be greater for investments in developing or emerging market countries.

Eurozone Investment Risks. Certain of the regions in which the Fund invests, including the European Union (EU), currently experience significant financial difficulties. Following the recent global economic crisis, some of these countries have depended on, and may continue to be dependent on, the assistance from others such as the European Central Bank (ECB) or other governments or institutions, and failure to implement reforms as a condition of assistance could have a significant adverse effect on the value of investments in those and other European countries. In addition, countries that have adopted the euro are subject to fiscal and monetary controls that could limit the ability to implement their own economic policies, and could voluntarily abandon, or be forced out of, the euro. Such events could impact the market values of Eurozone and various other securities and currencies, cause redenomination of certain securities into less valuable local currencies, and create more volatile and illiquid markets.

Special Risks of Developing and Emerging Markets. The economies of developing or emerging market countries may be more dependent on relatively few industries that may be highly vulnerable to local and global changes. The governments of developing and emerging market countries may also be more unstable than the governments of more developed countries and those countries are more likely to experience instability resulting from rapid changes or developments in social, political and economic conditions. These countries generally have less developed securities markets or exchanges, and less developed legal and accounting systems. Securities may be more difficult to sell at an acceptable price and may be more volatile than securities in countries with more mature markets. The value of developing or emerging market currencies may fluctuate more than the currencies of countries with more mature markets. Investments in developing or emerging market countries may be subject to greater risks of government restrictions, including confiscatory taxation, expropriation or nationalization of a company's assets, restrictions on foreign ownership of local companies and restrictions on withdrawing assets from the country. Investments in securities of issuers in developing or emerging market countries may be considered speculative.

Time-Zone Arbitrage. The Fund may invest in securities of foreign issuers that are traded in U.S. or foreign markets. If the Fund invests a significant amount of its assets in foreign markets, it may be exposed to "time-zone arbitrage" attempts by investors seeking to take advantage of differences in the values of foreign securities that might result from events that occur after the close of the foreign securities market on which a security is traded and before the Fund's net asset value is calculated. If such time-zone arbitrage were successful, it might dilute the interests of other shareholders. The Fund's use of "fair value pricing" to adjust certain market prices of foreign securities may help deter those activities.

Main Risks of Growth Investing. If a growth company's earnings or stock price fails to increase as anticipated, or if its business plans do not produce the expected results, its securities may decline sharply. Growth companies may be newer or smaller companies that may experience greater stock price fluctuations and risks of loss than larger, more established companies. Newer growth companies tend to retain a large part of their earnings for research, development or investments in capital assets. Therefore, they may not pay any dividends for some time. Growth investing has gone in and out of favor during past market cycles and is likely to continue to do so. During periods when growth investing is out of favor or when markets are unstable, it may be more difficult to sell growth company securities at an acceptable price. Growth stocks may also be more volatile than other securities because of investor speculation.

Who Is The Fund Designed For? The Fund is designed primarily for investors seeking capital appreciation. Those investors should be willing to assume the greater risks of share price fluctuations that are typical for an aggressive fund focusing on growth stock investments, and the special risks of investing in both developed and emerging foreign countries. The Fund does not seek current income and is not designed for investors needing income. The Fund is not a complete investment program. You should carefully consider your own investment goals and risk tolerance before investing in the Fund.

An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

The Fund's Past Performance. The bar chart and table below provide some indication of the risks of investing in the Fund by showing changes in the Fund's performance (for Class A shares) from calendar year to calendar year and by showing how the Fund's average annual returns for the periods of time shown in the table compare with those of a broad measure of market performance. The Fund's past investment performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. More recent performance information is available by calling the toll-free number on the back of this prospectus and on the Fund's website: https://www.oppenheimerfunds.com/fund/InternationalGrowthFund

Sales charges and taxes are not included in the calculations and the returns would be lower if they were. During the period shown, the highest return for a calendar quarter was 21.90% (2qtr09) and the lowest return was -19.43% (4qtr08). For the period from January 1, 2013 to December 31, 2013 the cumulative return before sales charges and taxes was 25.11%.

The following table shows the average annual total returns for each class of the Fund's shares. After-tax returns are calculated using the highest individual federal marginal income tax rates and do not reflect the impact of state or local taxes. Your actual after-tax returns, depending on your individual tax situation, may differ from those shown and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for only one class and after-tax returns for other classes will vary.

Average Annual Total Returns for the periods ended December 31, 2013

Average Annual Total Returns (Oppenheimer International Growth Fund)	Inception Date	1 Year	5 Years (or life of class, if less)		10 Years
Class A	Mar. 25, 1996	17.92%	15.90%		9.00%
Class A After Taxes on Distributions		17.54%	15.75%		8.83%
Class A After Taxes on Distributions and Sale of Fund Shares		10.13%	12.89%		7.38%
Class B	Mar. 25, 1996	19.18%	16.14%		9.13%
Class C	Mar. 25, 1996	23.18%	16.41%		8.83%
Class N	Mar. 01, 2001	23.79%	16.99%		9.34%
Class Y	Sep. 07, 2005	25.46%	17.79%		9.13%
Class I	Mar. 29, 2012	25.71%	19.43%
MSCI AC World ex-U.S. Index		15.29%	12.81%		7.57%
MSCI AC World ex-U.S. Index (reflects no deduction for fees, expenses or taxes)			11.55%	[1]	5.91%	[2]

[1] As of 3/31/2012

[2] As of 8/31/2005

[1] Expenses have been restated to reflect current fees.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Nov. 30, 2013
Registrant Name	dei_EntityRegistrantName	OPPENHEIMER INTERNATIONAL GROWTH FUND
Central Index Key	dei_EntityCentralIndexKey	0001005728
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Mar. 25, 2014
Document Effective Date	dei_DocumentEffectiveDate	Mar. 28, 2014
Prospectus Date	rr_ProspectusDate	Mar. 28, 2014