485BPOS

As filed with the U.S. Securities and Exchange Commission on November 13, 2012

Securities Act File No. 033-53399

Investment Company Act File No. 811-07171

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 25	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940 x

Amendment No. 27

(Check appropriate box or boxes)

BLACKROCK GLOBAL SMALLCAP FUND, INC.

(Exact Name of Registrant as Specified in Charter)

100 Bellevue Parkway

Wilmington, Delaware 19809

(Address of Principal Executive Office)

Registrant’s Telephone Number, including Area Code (800) 441-7762

John M. Perlowski

BlackRock Global SmallCap Fund, Inc.

55 East 52^nd Street, New York, New York 10055

(Name and Address of Agent for Service)

Copies to:

Counsel for the Fund: Margery K. Neale, Esq. Willkie Farr & Gallagher LLP 787 Seventh Avenue New York, New York 10019-6099 Benjamin Archibald, Esq. BlackRock Advisors, LLC 55 East 52^nd Street New York, New York 10055

Continuous

(Approximate Date of Proposed Offering)

It is proposed that this filing will become effective:

x immediately upon filing pursuant to paragraph (b)

¨ on (date) pursuant to paragraph (b)

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

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

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

¨ on (date) 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.

Title of Securities Being Registered: Shares of Common Stock, par value, $.10 per share.

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 the effectiveness of this Registration Statement under Rule 485(b) under the Securities Act and it 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 the State of New York on November 13, 2012.

	BLACKROCK GLOBAL SMALLCAP FUND, INC.
	(Registrant)
By:	/s/ JOHN PERLOWSKI
	(John M. Perlowski,
	Chief Executive Officer and President)

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

Signature	Title	Date
/s/ JOHN M. PERLOWSKI	President and Chief Executive Officer	November 13, 2012
John M. Perlowski	(Principal Executive Officer)
/s/ NEAL J. ANDREWS	Chief Financial Officer (Principal	November 13, 2012
Neal J. Andrews	Financial and Accounting Officer)
JAMES H. BODURTHA*	Director
(James H. Bodurtha)
BRUCE R. BOND*	Director
(Bruce R. Bond)
DONALD W. BURTON*	Director
(Donald W. Burton)
STUART E. EIZENSTAT*	Director
(Stuart E. Eizenstat)
KENNETH A. FROOT*	Director
(Kenneth A. Froot)
ROBERT M. HERNANDEZ*	Director
(Robert M. Hernandez)

	JOHN F. O’BRIEN*	Director
	(John F. O’Brien)
	ROBERTA COOPER RAMO*	Director
	(Roberta Cooper Ramo)
	DAVID H. WALSH*	Director
	(David H. Walsh)
	FRED G. WEISS*	Director
	(Fred G. Weiss)
	PAUL L. AUDET*	Director
	(Paul L. Audet)
	LAURENCE D. FINK*	Director
	(Laurence D. Fink)
	HENRY GABBAY*	Director
	(Henry Gabbay)
*By:	/s/ BENJAMIN ARCHIBALD		November 13, 2012
	Benjamin Archibald (Attorney-in-Fact)

EXHIBIT INDEX

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

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

BLACKROCK GLOBAL SMALLCAP FUND, INC.

Prospectus Date

rr_ProspectusDate

Oct. 26, 2012

BLACKROCK GLOBAL SMALLCAP FUND, INC.

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

Fund Overview

Key Facts about BlackRock Global SmallCap Fund, Inc.

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The investment objective of BlackRock Global SmallCap Fund, Inc. (the “Fund”) is to seek long-term growth of capital by investing primarily in a portfolio of equity securities of small cap issuers located in various foreign countries and in the United States.

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the BlackRock-advised fund complex. More information about these and other discounts is available from your financial professional and in the “Details about the Share Classes” section on page 18 of the Fund’s prospectus and in the “Purchase of Shares” section on page II-58 of the Fund’s statement of additional information.

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in 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 73% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

73.00%

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the BlackRock-advised fund complex.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

25,000

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund’s most recent annual report, which does not include Acquired Fund Fees and Expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example:

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This 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 the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. 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 costs would be:

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

rr_ExpenseExampleNoRedemptionByYearCaption

You would pay the following expenses if you did not redeem your shares:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies of the Fund

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests in a diversified portfolio primarily consisting of equity securities of small cap issuers in various foreign countries and in the United States. Equity securities consist primarily of common and preferred stocks and depositary receipts, and include securities convertible into common stock, and securities or other instruments whose price is linked to the value of common stock. Depositary receipts include American Depositary Receipts (“ADRs”), European Depositary Receipts (“EDRs”), Global Depositary Receipts (“GDRs”) and unsponsored Depositary Receipts. ADRs are receipts typically issued by an American bank or trust company that evidence underlying securities issued by a foreign corporation. EDRs (issued in Europe) and GDRs (issued throughout the world) each evidence a similar ownership arrangement. In addition, the Fund may invest in derivative securities or instruments, such as options and futures, the value of which is based on a common stock or a group of common stocks. The Fund may use derivatives to hedge its investment portfolio against market, interest rate and currency risks or to seek to enhance its return. The derivatives that the Fund may use include indexed and inverse securities, options, futures, swaps and forward foreign exchange transactions.

Under normal circumstances, the Fund invests at least 80% of its assets in equity securities of small cap issuers. Small cap issuers are those whose market capitalization is similar to the market capitalization of companies in the Morgan Stanley Capital International (“MSCI”) All Country World Small Cap Index^SM at the time of the Fund’s investment. As of September 28, 2012, the MSCI All Country World Small Cap Index^SM included companies with free float market capitalizations between $16.7 million and $5.984 billion. The market capitalizations of companies in the index change with market conditions and the composition of the MSCI All Country World Small Cap Index.^SM

The Fund will invest in securities of issuers from a variety of countries, including those in emerging markets. The Fund may also invest in equity securities issued by emerging growth companies, which are companies of any market capitalization without a long or consistent history of earnings but that Fund management believes have the potential for earnings growth over an extended period of time.

Under normal circumstances, the Fund anticipates it will allocate a substantial amount (approximately 40% or more — unless market conditions are not deemed favorable by Fund management, in which case the Fund would invest at least 30%) — of its total assets in foreign securities, which may include securities (i) of foreign government issuers, (ii) of issuers organized or located outside the U.S., (iii) of issuers which primarily trade in a market located outside the U.S., or (iv) of issuers doing a substantial amount of business outside the U.S., which the Fund considers to be companies that derive at least 50% of their revenue or profits from business outside the U.S. or have at least 50% of their sales or assets outside the U.S. The Fund will allocate its assets among various regions and countries, including the United States (but in no less than three different countries). The Fund may invest in securities denominated in any currency. For temporary defensive purposes the Fund may deviate substantially from the allocation described above.

Risk [Heading]

rr_RiskHeading

Principal Risks of Investing in the Fund

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund.

• Depositary Receipts Risk — The issuers of unsponsored depositary receipts are not obligated to disclose information that is, in the United States, considered material. Therefore, there may be less information available regarding these issuers and there may not be a correlation between such information and the market value of the depositary receipts. Depositary receipts are generally subject to the same risks as the foreign securities that they evidence or into which they may be converted.

• Derivatives Risk — The Fund’s use of derivatives may reduce the Fund’s returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund’s use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation is not yet known and may not be known for some time. New regulation may make derivatives more costly, may limit the availability of derivatives, or may otherwise adversely affect the value or performance of derivatives.

• Emerging Markets Risk — Emerging markets are riskier than more developed markets because they tend to develop unevenly and may never fully develop. Investments in emerging markets may be considered speculative. Emerging markets are more likely to experience hyperinflation and currency devaluations, which adversely affect returns to U.S. investors. In addition, many emerging securities markets have far lower trading volumes and less liquidity than developed markets.

• Equity Securities Risk — Stock markets are volatile. The price of equity securities fluctuates based on changes in a company’s financial condition and overall market and economic conditions.

• Foreign Securities Risk — Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:

— The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.

— Changes in foreign currency exchange rates can affect the value of the Fund’s portfolio.

— The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.

— The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.

— Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.

— Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.

— The European financial markets have recently experienced volatility and adverse trends due to concerns about economic downturns in, or rising government debt levels of several European countries. These events have adversely affected the exchange rate of the Euro and may spread to other countries in Europe, including countries that do not use the Euro. These events may affect the value and liquidity of certain of the Fund’s investments.

• Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

• Small Cap and Emerging Growth Securities Risk — Small cap or emerging growth companies may have limited product lines or markets. They may be less financially secure than larger, more established companies. They may depend on a more limited management group than larger capitalized companies.

Risk Lose Money [Text]

rr_RiskLoseMoney

You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund’s performance to that of the MSCI All Country World Small Cap Index, the MSCI World Index^SM and the MSCI World Small Cap Index^SM. Effective October 1, 2012, one of the Fund’s benchmarks against which it measures its performance, the MSCI World Small Cap Index, was replaced with the MSCI All Country World Small Cap Index. BlackRock believes the MSCI All Country World Small Cap Index more accurately reflects the investment strategy of the Fund. The MSCI All Country World Small Cap Index is a free float-adjusted market capitalization weighted index that is designed to measure equity market results of smaller capitalization companies in both developed and emerging markets. The returns for Class R Shares prior to February 4, 2003, the commencement of operation of Class R Shares, are based upon performance of the Fund’s Institutional Shares. The returns for Class R Shares, however, are adjusted to reflect the distribution and service (12b-1) fees applicable to Class R Shares. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund’s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund’s returns would have been lower. Updated information on the Fund’s performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800-882-0052

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

http://www.blackrock.com/funds

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

As with all such investments, past performance (before and after taxes) is not an indication of future results.

Bar Chart [Heading]

rr_BarChartHeading

Investor A Shares
ANNUAL TOTAL RETURNS
BlackRock Global SmallCap Fund
As of 12/31

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the ten-year period shown in the bar chart, the highest return for a quarter was 23.07% (quarter ended June 30, 2003) and the lowest return for a quarter was –21.46% (quarter ended December 31, 2008). The year-to-date return as of September 30, 2012 was 12.80%.

Performance Table Heading

rr_PerformanceTableHeading

As of 12/31/11
Average Annual Total Returns

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

However, the table includes all applicable fees and sales charges.

Performance Table Market Index Changed

rr_PerformanceTableMarketIndexChanged

Effective October 1, 2012, one of the Fund's benchmarks against which it measures its performance, the MSCI World Small Cap Index, was replaced with the MSCI All Country World Small Cap Index. BlackRock believes the MSCI All Country World Small Cap Index more accurately reflects the investment strategy of the Fund. The MSCI All Country World Small Cap Index is a free float-adjusted market capitalization weighted index that is designed to measure equity market results of smaller capitalization companies in both developed and emerging markets.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

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

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on the investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.

Performance Table Narrative

rr_PerformanceTableNarrativeTextBlock

After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.

BLACKROCK GLOBAL SMALLCAP FUND, INC. | Investor A Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.25%

Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

^[1]

Management Fee

rr_ManagementFeesOverAssets

0.85%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.32%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.43%

^[2]

1 Year

rr_ExpenseExampleYear01

663

3 Years

rr_ExpenseExampleYear03

954

5 Years

rr_ExpenseExampleYear05

1,266

10 Years

rr_ExpenseExampleYear10

2,148

2002

rr_AnnualReturn2002

(17.03%)

2003

rr_AnnualReturn2003

47.78%

2004

rr_AnnualReturn2004

13.77%

2005

rr_AnnualReturn2005

12.59%

2006

rr_AnnualReturn2006

18.18%

2007

rr_AnnualReturn2007

16.39%

2008

rr_AnnualReturn2008

(37.75%)

2009

rr_AnnualReturn2009

34.72%

2010

rr_AnnualReturn2010

18.31%

2011

rr_AnnualReturn2011

(10.68%)

Year to Date Return, Label

rr_YearToDateReturnLabel

year-to-date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2012

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

12.80%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2003

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

23.07%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.46%)

1 Year

rr_AverageAnnualReturnYear01

(15.37%)

5 Years

rr_AverageAnnualReturnYear05

(0.46%)

10 Years

rr_AverageAnnualReturnYear10

6.14%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | Investor B Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOfferingPrice

4.50%

^[3]

Management Fee

rr_ManagementFeesOverAssets

0.85%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.54%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.40%

^[2]

1 Year

rr_ExpenseExampleYear01

693

3 Years

rr_ExpenseExampleYear03

1,098

5 Years

rr_ExpenseExampleYear05

1,480

10 Years

rr_ExpenseExampleYear10

2,495

1 Year

rr_ExpenseExampleNoRedemptionYear01

243

3 Years

rr_ExpenseExampleNoRedemptionYear03

748

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,280

10 Years

rr_ExpenseExampleNoRedemptionYear10

2,495

1 Year

rr_AverageAnnualReturnYear01

(15.54%)

5 Years

rr_AverageAnnualReturnYear05

(0.59%)

10 Years

rr_AverageAnnualReturnYear10

6.02%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | Investor C Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOfferingPrice

1.00%

^[4]

Management Fee

rr_ManagementFeesOverAssets

0.85%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.42%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.28%

^[2]

1 Year

rr_ExpenseExampleYear01

331

3 Years

rr_ExpenseExampleYear03

712

5 Years

rr_ExpenseExampleYear05

1,220

10 Years

rr_ExpenseExampleYear10

2,615

1 Year

rr_ExpenseExampleNoRedemptionYear01

231

3 Years

rr_ExpenseExampleNoRedemptionYear03

712

5 Years

rr_ExpenseExampleNoRedemptionYear05

1,220

10 Years

rr_ExpenseExampleNoRedemptionYear10

2,615

1 Year

rr_AverageAnnualReturnYear01

(12.37%)

5 Years

rr_AverageAnnualReturnYear05

(0.22%)

10 Years

rr_AverageAnnualReturnYear10

5.85%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | Institutional Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management Fee

rr_ManagementFeesOverAssets

0.85%

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

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.27%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.13%

^[2]

1 Year

rr_ExpenseExampleYear01

115

3 Years

rr_ExpenseExampleYear03

359

5 Years

rr_ExpenseExampleYear05

622

10 Years

rr_ExpenseExampleYear10

1,375

1 Year

rr_AverageAnnualReturnYear01

(10.48%)

5 Years

rr_AverageAnnualReturnYear05

0.91%

10 Years

rr_AverageAnnualReturnYear10

7.00%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | Class R Shares

Risk/Return:

rr_RiskReturnAbstract

Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Management Fee

rr_ManagementFeesOverAssets

0.85%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.48%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.84%

^[2]

1 Year

rr_ExpenseExampleYear01

187

3 Years

rr_ExpenseExampleYear03

579

5 Years

rr_ExpenseExampleYear05

995

10 Years

rr_ExpenseExampleYear10

2,159

1 Year

rr_AverageAnnualReturnYear01

(11.10%)

5 Years

rr_AverageAnnualReturnYear05

0.17%

10 Years

rr_AverageAnnualReturnYear10

6.41%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | Return After Taxes on Distributions | Investor A Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(15.72%)

5 Years

rr_AverageAnnualReturnYear05

(1.59%)

10 Years

rr_AverageAnnualReturnYear10

5.10%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | Return After Taxes on Distributions and Sale of Shares | Investor A Shares

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(9.99%)

5 Years

rr_AverageAnnualReturnYear05

(0.71%)

10 Years

rr_AverageAnnualReturnYear10

5.04%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | MSCI World IndexSM (Reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(5.54%)

5 Years

rr_AverageAnnualReturnYear05

(2.37%)

10 Years

rr_AverageAnnualReturnYear10

3.62%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | MSCI World Small Cap IndexSM (Reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(9.06%)

5 Years

rr_AverageAnnualReturnYear05

(0.64%)

10 Years

rr_AverageAnnualReturnYear10

8.02%

BLACKROCK GLOBAL SMALLCAP FUND, INC. | MSCI All Country World Small Cap Index (Reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(11.30%)

5 Years

rr_AverageAnnualReturnYear05

0.31%

10 Years

rr_AverageAnnualReturnYear10

8.86%

[1] A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

[2] The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's most recent annual report, which does not include Acquired Fund Fees and Expenses.

[3] The CDSC is 4.50% if shares are redeemed in less than one year. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes - Investor B Shares" in the Fund's prospectus for the complete schedule of CDSCs.)

[4] There is no CDSC on Investor C Shares after one year.

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BLACKROCK GLOBAL SMALLCAP FUND, INC.

Fund Overview

Key Facts about BlackRock Global SmallCap Fund, Inc.

Investment Objective

The investment objective of BlackRock Global SmallCap Fund, Inc. (the “Fund”) is to seek long-term growth of capital by investing primarily in a portfolio of equity securities of small cap issuers located in various foreign countries and in the United States.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in the BlackRock-advised fund complex. More information about these and other discounts is available from your financial professional and in the “Details about the Share Classes” section on page 18 of the Fund’s prospectus and in the “Purchase of Shares” section on page II-58 of the Fund’s statement of additional information.

Shareholder Fees
(fees paid directly from your investment)

Shareholder Fees BLACKROCK GLOBAL SMALLCAP FUND, INC.	Investor A Shares		Investor B Shares		Investor C Shares		Institutional Shares	Class R Shares
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)	5.25%		none		none		none	none
Maximum Deferred Sales Charge (Load) (as percentage of offering price or redemption proceeds, whichever is lower)	none	[1]	4.50%	[2]	1.00%	[3]	none	none

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

Annual Fund Operating Expenses BLACKROCK GLOBAL SMALLCAP FUND, INC.		Investor A Shares	Investor B Shares	Investor C Shares	Institutional Shares	Class R Shares
Management Fee		0.85%	0.85%	0.85%	0.85%	0.85%
Distribution and/or Service (12b-1) Fees		0.25%	1.00%	1.00%	none	0.50%
Other Expenses		0.32%	0.54%	0.42%	0.27%	0.48%
Acquired Fund Fees and Expenses	[1]	0.01%	0.01%	0.01%	0.01%	0.01%
Total Annual Fund Operating Expenses	[1]	1.43%	2.40%	2.28%	1.13%	1.84%

Example:

This 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 the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. 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 costs would be:

Expense Example BLACKROCK GLOBAL SMALLCAP FUND, INC. (USD $)	1 Year	3 Years	5 Years	10 Years
Investor A Shares	663	954	1,266	2,148
Investor B Shares	693	1,098	1,480	2,495
Investor C Shares	331	712	1,220	2,615
Institutional Shares	115	359	622	1,375
Class R Shares	187	579	995	2,159

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption BLACKROCK GLOBAL SMALLCAP FUND, INC. (USD $)	1 Year	3 Years	5 Years	10 Years
Investor B Shares	243	748	1,280	2,495
Investor C Shares	231	712	1,220	2,615

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 may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in 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 73% of the average value of its portfolio.

Principal Investment Strategies of the Fund

The Fund invests in a diversified portfolio primarily consisting of equity securities of small cap issuers in various foreign countries and in the United States. Equity securities consist primarily of common and preferred stocks and depositary receipts, and include securities convertible into common stock, and securities or other instruments whose price is linked to the value of common stock. Depositary receipts include American Depositary Receipts (“ADRs”), European Depositary Receipts (“EDRs”), Global Depositary Receipts (“GDRs”) and unsponsored Depositary Receipts. ADRs are receipts typically issued by an American bank or trust company that evidence underlying securities issued by a foreign corporation. EDRs (issued in Europe) and GDRs (issued throughout the world) each evidence a similar ownership arrangement. In addition, the Fund may invest in derivative securities or instruments, such as options and futures, the value of which is based on a common stock or a group of common stocks. The Fund may use derivatives to hedge its investment portfolio against market, interest rate and currency risks or to seek to enhance its return. The derivatives that the Fund may use include indexed and inverse securities, options, futures, swaps and forward foreign exchange transactions.

Under normal circumstances, the Fund invests at least 80% of its assets in equity securities of small cap issuers. Small cap issuers are those whose market capitalization is similar to the market capitalization of companies in the Morgan Stanley Capital International (“MSCI”) All Country World Small Cap Index^SM at the time of the Fund’s investment. As of September 28, 2012, the MSCI All Country World Small Cap Index^SM included companies with free float market capitalizations between $16.7 million and $5.984 billion. The market capitalizations of companies in the index change with market conditions and the composition of the MSCI All Country World Small Cap Index.^SM

The Fund will invest in securities of issuers from a variety of countries, including those in emerging markets. The Fund may also invest in equity securities issued by emerging growth companies, which are companies of any market capitalization without a long or consistent history of earnings but that Fund management believes have the potential for earnings growth over an extended period of time.

Under normal circumstances, the Fund anticipates it will allocate a substantial amount (approximately 40% or more — unless market conditions are not deemed favorable by Fund management, in which case the Fund would invest at least 30%) — of its total assets in foreign securities, which may include securities (i) of foreign government issuers, (ii) of issuers organized or located outside the U.S., (iii) of issuers which primarily trade in a market located outside the U.S., or (iv) of issuers doing a substantial amount of business outside the U.S., which the Fund considers to be companies that derive at least 50% of their revenue or profits from business outside the U.S. or have at least 50% of their sales or assets outside the U.S. The Fund will allocate its assets among various regions and countries, including the United States (but in no less than three different countries). The Fund may invest in securities denominated in any currency. For temporary defensive purposes the Fund may deviate substantially from the allocation described above.

Principal Risks of Investing in the Fund

Risk is inherent in all investing. The value of your investment in the Fund, as well as the amount of return you receive on your investment, may fluctuate significantly from day to day and over time. You may lose part or all of your investment in the Fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks of investing in the Fund.

• Depositary Receipts Risk — The issuers of unsponsored depositary receipts are not obligated to disclose information that is, in the United States, considered material. Therefore, there may be less information available regarding these issuers and there may not be a correlation between such information and the market value of the depositary receipts. Depositary receipts are generally subject to the same risks as the foreign securities that they evidence or into which they may be converted.

• Derivatives Risk — The Fund’s use of derivatives may reduce the Fund’s returns and/or increase volatility. Volatility is defined as the characteristic of a security, an index or a market to fluctuate significantly in price within a short time period. Derivatives are also subject to counterparty risk, which is the risk that the other party in the transaction will not fulfill its contractual obligation. A risk of the Fund’s use of derivatives is that the fluctuations in their values may not correlate perfectly with the overall securities markets. The possible lack of a liquid secondary market for derivatives and the resulting inability of the Fund to sell or otherwise close a derivatives position could expose the Fund to losses and could make derivatives more difficult for the Fund to value accurately. Derivatives may give rise to a form of leverage and may expose the Fund to greater risk and increase its costs. Recent legislation calls for new regulation of the derivatives markets. The extent and impact of the regulation is not yet known and may not be known for some time. New regulation may make derivatives more costly, may limit the availability of derivatives, or may otherwise adversely affect the value or performance of derivatives.

• Emerging Markets Risk — Emerging markets are riskier than more developed markets because they tend to develop unevenly and may never fully develop. Investments in emerging markets may be considered speculative. Emerging markets are more likely to experience hyperinflation and currency devaluations, which adversely affect returns to U.S. investors. In addition, many emerging securities markets have far lower trading volumes and less liquidity than developed markets.

• Equity Securities Risk — Stock markets are volatile. The price of equity securities fluctuates based on changes in a company’s financial condition and overall market and economic conditions.

• Foreign Securities Risk — Foreign investments often involve special risks not present in U.S. investments that can increase the chances that the Fund will lose money. These risks include:

— The Fund generally holds its foreign securities and cash in foreign banks and securities depositories, which may be recently organized or new to the foreign custody business and may be subject to only limited or no regulatory oversight.

— Changes in foreign currency exchange rates can affect the value of the Fund’s portfolio.

— The economies of certain foreign markets may not compare favorably with the economy of the United States with respect to such issues as growth of gross national product, reinvestment of capital, resources and balance of payments position.

— The governments of certain countries may prohibit or impose substantial restrictions on foreign investments in their capital markets or in certain industries.

— Many foreign governments do not supervise and regulate stock exchanges, brokers and the sale of securities to the same extent as does the United States and may not have laws to protect investors that are comparable to U.S. securities laws.

— Settlement and clearance procedures in certain foreign markets may result in delays in payment for or delivery of securities not typically associated with settlement and clearance of U.S. investments.

— The European financial markets have recently experienced volatility and adverse trends due to concerns about economic downturns in, or rising government debt levels of several European countries. These events have adversely affected the exchange rate of the Euro and may spread to other countries in Europe, including countries that do not use the Euro. These events may affect the value and liquidity of certain of the Fund’s investments.

• Market Risk and Selection Risk — Market risk is the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. Selection risk is the risk that the securities selected by Fund management will underperform the markets, the relevant indices or the securities selected by other funds with similar investment objectives and investment strategies. This means you may lose money.

• Small Cap and Emerging Growth Securities Risk — Small cap or emerging growth companies may have limited product lines or markets. They may be less financially secure than larger, more established companies. They may depend on a more limited management group than larger capitalized companies.

Performance Information

The information shows you how the Fund’s performance has varied year by year and provides some indication of the risks of investing in the Fund. The table compares the Fund’s performance to that of the MSCI All Country World Small Cap Index, the MSCI World Index^SM and the MSCI World Small Cap Index^SM. Effective October 1, 2012, one of the Fund’s benchmarks against which it measures its performance, the MSCI World Small Cap Index, was replaced with the MSCI All Country World Small Cap Index. BlackRock believes the MSCI All Country World Small Cap Index more accurately reflects the investment strategy of the Fund. The MSCI All Country World Small Cap Index is a free float-adjusted market capitalization weighted index that is designed to measure equity market results of smaller capitalization companies in both developed and emerging markets. The returns for Class R Shares prior to February 4, 2003, the commencement of operation of Class R Shares, are based upon performance of the Fund’s Institutional Shares. The returns for Class R Shares, however, are adjusted to reflect the distribution and service (12b-1) fees applicable to Class R Shares. As with all such investments, past performance (before and after taxes) is not an indication of future results. Sales charges are not reflected in the bar chart. If they were, returns would be less than those shown. However, the table includes all applicable fees and sales charges. If the Fund’s investment manager and its affiliates had not waived or reimbursed certain Fund expenses during these periods, the Fund’s returns would have been lower. Updated information on the Fund’s performance can be obtained by visiting http://www.blackrock.com/funds or can be obtained by phone at 800-882-0052.

Investor A Shares
ANNUAL TOTAL RETURNS
BlackRock Global SmallCap Fund
As of 12/31

During the ten-year period shown in the bar chart, the highest return for a quarter was 23.07% (quarter ended June 30, 2003) and the lowest return for a quarter was –21.46% (quarter ended December 31, 2008). The year-to-date return as of September 30, 2012 was 12.80%.

As of 12/31/11
Average Annual Total Returns

Average Annual Total Returns BLACKROCK GLOBAL SMALLCAP FUND, INC.	1 Year	5 Years	10 Years
Investor A	(15.37%)	(0.46%)	6.14%
Investor A Return After Taxes on Distributions	(15.72%)	(1.59%)	5.10%
Investor A Return After Taxes on Distributions and Sale of Shares	(9.99%)	(0.71%)	5.04%
Investor B	(15.54%)	(0.59%)	6.02%
Investor C	(12.37%)	(0.22%)	5.85%
Institutional	(10.48%)	0.91%	7.00%
Class R	(11.10%)	0.17%	6.41%
MSCI World IndexSM (Reflects no deduction for fees, expenses or taxes)	(5.54%)	(2.37%)	3.62%
MSCI World Small Cap IndexSM (Reflects no deduction for fees, expenses or taxes)	(9.06%)	(0.64%)	8.02%
MSCI All Country World Small Cap Index (Reflects no deduction for fees, expenses or taxes)	(11.30%)	0.31%	8.86%

After-tax returns are calculated using the historical highest individual Federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Investor A Shares only, and the after-tax returns for Investor B, Investor C, Institutional and Class R Shares will vary.

[1] A contingent deferred sales charge ("CDSC") of 1.00% is assessed on certain redemptions of Investor A Shares made within 18 months after purchase where no initial sales charge was paid at time of purchase as part of an investment of $1,000,000 or more.

[2] The CDSC is 4.50% if shares are redeemed in less than one year. The CDSC for Investor B Shares decreases for redemptions made in subsequent years. After six years there is no CDSC on Investor B Shares. (See the section "Details about the Share Classes - Investor B Shares" in the Fund's prospectus for the complete schedule of CDSCs.)

[3] There is no CDSC on Investor C Shares after one year.

[1] The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets given in the Fund's most recent annual report, which does not include Acquired Fund Fees and Expenses.

XML

Document and Entity Information	12 Months Ended
	Oct. 26, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Jun. 30, 2012
Registrant Name	BLACKROCK GLOBAL SMALLCAP FUND, INC.
Central Index Key	0000922457
Amendment Flag	false
Document Creation Date	Oct. 26, 2012
Document Effective Date	Oct. 26, 2012
Prospectus Date	Oct. 26, 2012

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BLACKROCK GLOBAL SMALLCAP FUND, INC.
Prospectus Date	rr_ProspectusDate	Oct. 26, 2012
Document Creation Date	dei_DocumentCreationDate	Oct. 26, 2012