485BPOS

As filed with the Securities and Exchange Commission on February 12, 2013

Securities Act File No. 33-48220

Investment Company Act File No. 811-06687

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. 31	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 33	x

THE GABELLI MONEY MARKET FUNDS

(Exact Name of Registrant as Specified in Charter)

One Corporate Center, Rye,

New York 10580-1422

(Address of Principal Executive Offices)

Registrant’s Telephone Number, including Area Code: 1-800-422-3554

Bruce N. Alpert

Gabelli Funds, LLC

One Corporate Center

Rye, New York 10580-1422

(Name and Address of Agent for Service)

Copies to:

Sonia K. Kothari, Esq.	Michael R. Rosella, Esq.
The Gabelli Money Market Funds	Paul Hastings LLP
One Corporate Center	75 East 55th Street
Rye, New York 10580-1422	New York, New York 10022

It is proposed that this filing will become effective:

x immediately upon filing pursuant to paragraph (b);or

¨ on [                    ] pursuant to paragraph (b);or

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

¨ on             pursuant to paragraph (a)(1);or

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

¨ 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, as amended, and the Investment Company Act of 1940, as amended, the Registrant, THE GABELLI MONEY MARKET FUNDS, certifies that it meets all the requirements for effectiveness of this Post-Effective Amendment to its Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this Post-Effective Amendment to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Rye and State of New York, on the 12th day of February, 2013.

THE GABELLI MONEY MARKET FUNDS
By:	/s/ Bruce N. Alpert
	Bruce N. Alpert
	President and Principal Executive Officer

Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment No. 31 to its Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signatures	Title	Date
/s/ Bruce N. Alpert Bruce N. Alpert	President and Principal Executive Officer	February 12, 2013
/s/ Agnes Mullady Agnes Mullady	Principal Financial Officer and Treasurer	February 12, 2013
Mario J. Gabelli* Mario J. Gabelli	Trustee	February 12, 2013
Anthony J. Colavita* Anthony J. Colavita	Trustee	February 12, 2013
Vincent D. Enright* Vincent D. Enright	Trustee	February 12, 2013
Anthonie C. van Ekris* Anthonie C. van Ekris	Trustee	February 12, 2013

*By:	/s/ Bruce N. Alpert
	Bruce N. Alpert
	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
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxomony Extension Presentation Linkbase

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	GABELLI MONEY MARKET FUNDS
Prospectus Date	rr_ProspectusDate	Jan. 28, 2013
Class AAA Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	SUMMARY OF THE FUND
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide high current income consistent with the preservation of principal and liquidity.
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 Class AAA Shares of the Fund.
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):
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This example is intended to help you compare the cost of investing in Class AAA Shares of 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 (taking into account the expense limitation for one year). 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 Class AAA Shares of the Fund:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund invests at least 80% of its net assets in U.S. Treasury obligations, including U.S. Treasury bills, U.S. Treasury notes, U.S. Treasury bonds, and U.S. Treasury strips, which have remaining maturities of 397 days or less. Currently, the Fund invests exclusively in such U.S. Treasury obligations. The Fund is a money market fund managed to meet the requirements of Rule 2a-7 under the Investment Company Act of 1940 (the “1940 Act”). Within these requirements, the Fund will seek to maintain a net asset value of $1.00 per share. Other requirements pertain to the maturity, liquidity and credit quality of the securities in which the Fund may invest. The Fund will only invest in securities which have, or are deemed to have, a remaining maturity of 397 days or less. Also, the dollar-weighted average maturity for all securities contained in the Fund is required to be sixty days or less. In addition, the Fund will limit its dollar-weighted average life (portfolio maturity measured without reference to any maturity shortening provisions of adjustable rate securities by reference to their interest rate reset date) to 120 days. The investment manager may consider the following factors when buying and selling securities for the Fund: (i) portfolio liquidity and (ii) redemption requests. You May Want to Invest in the Fund if: you desire a fund with lower expenses than the average U.S. Treasury money market fund you seek stability of principal more than growth of capital or high current income you seek income free from state and local taxes you intend to exchange into other Gabelli sponsored mutual funds
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	An investment in the Fund is subject to the risk that the Fund’s yield will decline due to falling interest rates. Other factors may affect the market price and yield of the Fund’s securities, including investor demand and domestic and worldwide economic conditions. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. There is no guarantee that the Fund can achieve its investment objective. Recently, money market funds have experienced significant pressures from shareholder redemptions and historically low yields on securities they can hold. Therefore, it is possible that a money market fund may no longer be able to value its shares at $1.00.
Risk Money Market Fund [Text]	rr_RiskMoneyMarketFund	Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, and by showing the Fund’s average annual returns for one year, five years, and ten years. For current 7 day yield information on the Fund, call 800-GABELLI (800-422-3554). As with all mutual funds, the Fund’s past performance does not predict how the Fund will perform in the future. Updated information on the Fund’s results can be obtained by visting www.gabelli.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year, and by showing the Fund's average annual returns for one year, five years, and ten years.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.gabelli.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	As with all mutual funds, the Fund's past performance does not predict how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	THE GABELLI U.S. TREASURY MONEY MARKET FUND (Total Returns for the Years Ended December 31)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown in the bar chart, the highest return for a quarter was 1.26% (quarter ended December 31, 2006) and the lowest return for a quarter was 0.00% (quarter ended June 30, 2012).
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (For the periods ended December 31, 2012)
Money Market Seven Day Yield Phone	rr_MoneyMarketSevenDayYieldPhone	800-GABELLI (800-422-3554)
Class AAA Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND | Class AAA Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of redemption or offering price, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (as a percentage of amount invested)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fees	rr_RedemptionFee	5.00
Exchange Fee	rr_ExchangeFee	none
Account Closeout Fee	rr_MaximumAccountFee	5.00
Management Fees	rr_ManagementFeesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.03%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.11%
Less Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.03%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	0.08%	[1]
1 Year	rr_ExpenseExampleYear01	13
3 Years	rr_ExpenseExampleYear03	37
5 Years	rr_ExpenseExampleYear05	64
10 Years	rr_ExpenseExampleYear10	143
1 Year	rr_ExpenseExampleNoRedemptionYear01	8
3 Years	rr_ExpenseExampleNoRedemptionYear03	32
5 Years	rr_ExpenseExampleNoRedemptionYear05	59
10 Years	rr_ExpenseExampleNoRedemptionYear10	138
2003	rr_AnnualReturn2003	0.83%
2004	rr_AnnualReturn2004	0.95%
2005	rr_AnnualReturn2005	2.72%
2006	rr_AnnualReturn2006	4.74%
2007	rr_AnnualReturn2007	4.74%
2008	rr_AnnualReturn2008	2.08%
2009	rr_AnnualReturn2009	0.22%
2010	rr_AnnualReturn2010	0.07%
2011	rr_AnnualReturn2011	0.02%
2012	rr_AnnualReturn2012	0.02%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2006
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	1.26%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2012
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	0.00%
Class AAA Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND | Return Before Taxes | Class AAA Shares
Risk/Return:	rr_RiskReturnAbstract
Column	rr_AverageAnnualReturnColumnName	Class AAA Shares
Label	rr_AverageAnnualReturnLabel	Return Before Taxes
Past One Year	rr_AverageAnnualReturnYear01	0.02%
Past Five Years	rr_AverageAnnualReturnYear05	0.48%
Past Ten Years	rr_AverageAnnualReturnYear10	1.62%

[1] Gabelli Funds, LLC (the "Manager") has contractually agreed to waive management fees and/or reimburse expenses of the Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding interest, acquired fund fees and expenses, taxes, and extraordinary expenses) at no more than 0.08% of the Fund's average daily net assets for Class AAA Shares. This arrangement is in effect through January 31, 2014. Thereafter, this arrangement will renew automatically for an additional one-year period, unless the Fund or the Manager provides the other with written notice of termination at least sixty days prior to the expiration of the then current term.

XML

Class AAA Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND

SUMMARY OF THE FUND

Investment Objective

The Fund seeks to provide high current income consistent with the preservation of principal and liquidity.

Fees and Expenses of the Fund:

This table describes the fees and expenses that you may pay if you buy and hold Class AAA Shares of the Fund.

Shareholder Fees (fees paid directly from your investment):

Shareholder Fees (USD $)	Class AAA Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none
Maximum Deferred Sales Charge (Load) (as a percentage of redemption or offering price, whichever is lower)	none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (as a percentage of amount invested)	none
Redemption Fees	5.00
Exchange Fee	none
Account Closeout Fee	5.00

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

Annual Fund Operating Expenses		Class AAA Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND
Management Fees		0.08%
Other Expenses		0.03%
Total Annual Fund Operating Expenses		0.11%
Less Fee Waiver and/or Expense Reimbursement	[1]	(0.03%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	[1]	0.08%

Expense Example

This example is intended to help you compare the cost of investing in Class AAA Shares of 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 (taking into account the expense limitation for one year). Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example (USD $)	1 Year	3 Years	5 Years	10 Years
Class AAA Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND	13	37	64	143

You would pay the following expenses if you did not redeem your Class AAA Shares of the Fund:

Expense Example, No Redemption (USD $)	1 Year	3 Years	5 Years	10 Years
Class AAA Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND	8	32	59	138

Principal Investment Strategies

Under normal market conditions, the Fund invests at least 80% of its net assets in U.S. Treasury obligations, including U.S. Treasury bills, U.S. Treasury notes, U.S. Treasury bonds, and U.S. Treasury strips, which have remaining maturities of 397 days or less. Currently, the Fund invests exclusively in such U.S. Treasury obligations.

The Fund is a money market fund managed to meet the requirements of Rule 2a-7 under the Investment Company Act of 1940 (the “1940 Act”). Within these requirements, the Fund will seek to maintain a net asset value of $1.00 per share. Other requirements pertain to the maturity, liquidity and credit quality of the securities in which the Fund may invest. The Fund will only invest in securities which have, or are deemed to have, a remaining maturity of 397 days or less. Also, the dollar-weighted average maturity for all securities contained in the Fund is required to be sixty days or less. In addition, the Fund will limit its dollar-weighted average life (portfolio maturity measured without reference to any maturity shortening provisions of adjustable rate securities by reference to their interest rate reset date) to 120 days.

The investment manager may consider the following factors when buying and selling securities for the Fund: (i) portfolio liquidity and (ii) redemption requests.

You May Want to Invest in the Fund if:

• you desire a fund with lower expenses than the average U.S. Treasury money market fund
• you seek stability of principal more than growth of capital or high current income
• you seek income free from state and local taxes
• you intend to exchange into other Gabelli sponsored mutual funds

Principal Risks

An investment in the Fund is subject to the risk that the Fund’s yield will decline due to falling interest rates. Other factors may affect the market price and yield of the Fund’s securities, including investor demand and domestic and worldwide economic conditions. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. There is no guarantee that the Fund can achieve its investment objective.

Recently, money market funds have experienced significant pressures from shareholder redemptions and historically low yields on securities they can hold. Therefore, it is possible that a money market fund may no longer be able to value its shares at $1.00.

Performance

The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, and by showing the Fund’s average annual returns for one year, five years, and ten years. For current 7 day yield information on the Fund, call 800-GABELLI (800-422-3554). As with all mutual funds, the Fund’s past performance does not predict how the Fund will perform in the future. Updated information on the Fund’s results can be obtained by visting www.gabelli.com.

THE GABELLI U.S. TREASURY MONEY MARKET FUND
(Total Returns for the Years Ended December 31)

During the periods shown in the bar chart, the highest return for a quarter was 1.26% (quarter ended December 31, 2006) and the lowest return for a quarter was 0.00% (quarter ended June 30, 2012).

Average Annual Total Returns
(For the periods ended December 31, 2012)

Average Annual Total Returns	Column	Label	Past One Year	Past Five Years	Past Ten Years
Class AAA Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND Return Before Taxes	Class AAA Shares	Return Before Taxes	0.02%	0.48%	1.62%

[1] Gabelli Funds, LLC (the "Manager") has contractually agreed to waive management fees and/or reimburse expenses of the Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding interest, acquired fund fees and expenses, taxes, and extraordinary expenses) at no more than 0.08% of the Fund's average daily net assets for Class AAA Shares. This arrangement is in effect through January 31, 2014. Thereafter, this arrangement will renew automatically for an additional one-year period, unless the Fund or the Manager provides the other with written notice of termination at least sixty days prior to the expiration of the then current term.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	GABELLI MONEY MARKET FUNDS
Prospectus Date	rr_ProspectusDate	Jan. 28, 2013
Class A and C Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	SUMMARY OF THE FUND
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide high current income consistent with the preservation of principal and liquidity.
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 Class A or Class C Shares of the Fund.
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):
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This example is intended to help you compare the cost of investing in shares of 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, that you pay the maximum contingent deferred sales charge (you had exchanged into the Fund when you were still subject to a deferred sales charge), and that the Fund’s operating expenses remain the same (taking into account the expense limitation for one year). 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 of the Fund:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund invests at least 80% of its net assets in U.S. Treasury obligations, including U.S. Treasury bills, U.S. Treasury notes, U.S. Treasury bonds, and U.S. Treasury strips, which have remaining maturities of 397 days or less. Currently, the Fund invests exclusively in such U.S. Treasury obligations. The Fund is a money market fund managed to meet the requirements of Rule 2a-7 under the Investment Company Act of 1940 (the “1940 Act”). Within these requirements, the Fund will seek to maintain a net asset value of $1.00 per share. Other requirements pertain to the maturity, liquidity and credit quality of the securities in which the Fund may invest. The Fund will only invest in securities which have, or are deemed to have, a remaining maturity of 397 days or less. Also, the dollar-weighted average maturity for all securities contained in the Fund is required to be sixty days or less. In addition, the Fund will limit its dollar-weighted average life (portfolio maturity measured without reference to any maturity shortening provisions of adjustable rate securities by reference to their interest rate reset date) to 120 days. The investment manager may consider the following factors when buying and selling securities for the Fund: (i) portfolio liquidity and (ii) redemption requests. You May Want to Invest in the Fund if: you desire a fund with lower expenses than the average U.S. Treasury money market fund you seek stability of principal more than growth of capital or high current income you seek income free from state and local taxes you intend to exchange into other Gabelli sponsored mutual funds
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	An investment in the Fund is subject to the risk that the Fund’s yield will decline due to falling interest rates. Other factors may affect the market price and yield of the Fund’s securities, including investor demand and domestic and worldwide economic conditions. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. There is no guarantee that the Fund can achieve its investment objective. Recently, money market funds have experienced significant pressures from shareholder redemptions and historically low yields on securities they can hold. Therefore, it is possible that a money market fund may no longer be able to value its shares at $1.00.
Risk Money Market Fund [Text]	rr_RiskMoneyMarketFund	Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, and by showing the Fund’s average annual returns for one year, five years, and ten years. For current 7 day yield information on the Fund, call 800-GABELLI (800-422-3554). As with all mutual funds, the Fund’s past performance does not predict how the Fund will perform in the future. Updated information on the Fund’s results can be obtained by visiting www.gabelli.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, and by showing the Fund’s average annual returns for one year, five years, and ten years.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.gabelli.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	As with all mutual funds, the Fund’s past performance does not predict how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	THE GABELLI U.S. TREASURY MONEY MARKET FUND (Total Returns for the Years Ended December 31)
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The bar chart above shows the performance of the Class AAA Shares of the Fund (which are offered in a separate prospectus) for the years ended December 31, 2003, through December 31, 2007, and the period from January 1, 2008, through November 13, 2008; and the performance of the Class A Shares for the period from November 14, 2008, through December 31, 2008, and the years ended December 31, 2009, through December 31, 2012. The historical performance of the Class AAA Shares is used for the periods before the inception of the Class A Shares. Sales loads are not reflected in the above chart. If sales loads were reflected, the Class A performance would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	Sales loads are not reflected in the above chart. If sales loads were reflected, the Class A performance would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	During the periods shown in the bar chart, the highest return for a quarter was 1.26% (quarter ended December 31, 2006), and the lowest return for a quarter was 0.00% (quarter ended June 30, 2012).
Bar Chart, Returns for Class Not Offered in Prospectus [Text]	rr_BarChartReturnsForClassNotOfferedInProspectus	The bar chart above shows the performance of the Class AAA Shares of the Fund (which are offered in a separate prospectus) for the years ended December 31, 2003, through December 31, 2007, and the period from January 1, 2008, through November 13, 2008; and the performance of the Class A Shares for the period from November 14, 2008, through December 31, 2008, and the years ended December 31, 2009, through December 31, 2012.
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns (for the periods ended December 31, 2012)
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	The returns shown for Class A and Class C Shares prior to their actual inception dates are those of the Class AAA Shares of the Fund (which are offered in a separate prospectus). All Classes of the Fund would have substantially similar annual returns because the shares are invested in the same portfolio of securities and the annual returns would differ only to the extent that the Classes do not have the same expenses.
Money Market Seven Day Yield Phone	rr_MoneyMarketSevenDayYieldPhone	800-GABELLI (800-422-3554)
Class A and C Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND | Class A Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of redemption or offering price, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (as a percentage of amount invested)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fees	rr_RedemptionFee	5.00
Exchange Fee	rr_ExchangeFee	none
Account Closeout Fee	rr_MaximumAccountFee	5.00
Management Fees	rr_ManagementFeesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.03%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.11%
Less Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.03%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	0.08%	[1]
1 Year	rr_ExpenseExampleYear01	13
3 Years	rr_ExpenseExampleYear03	37
5 Years	rr_ExpenseExampleYear05	64
10 Years	rr_ExpenseExampleYear10	143
1 Year	rr_ExpenseExampleNoRedemptionYear01	8
3 Years	rr_ExpenseExampleNoRedemptionYear03	32
5 Years	rr_ExpenseExampleNoRedemptionYear05	59
10 Years	rr_ExpenseExampleNoRedemptionYear10	138
2003	rr_AnnualReturn2003	0.83%
2004	rr_AnnualReturn2004	0.95%
2005	rr_AnnualReturn2005	2.72%
2006	rr_AnnualReturn2006	4.74%
2007	rr_AnnualReturn2007	4.74%
2008	rr_AnnualReturn2008	2.08%
2009	rr_AnnualReturn2009	0.22%
2010	rr_AnnualReturn2010	0.07%
2011	rr_AnnualReturn2011	0.02%
2012	rr_AnnualReturn2012	0.02%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	highest return
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2006
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	1.26%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	lowest return
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2012
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	0.00%
Class A and C Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND | Class C Shares
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of redemption or offering price, whichever is lower)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (as a percentage of amount invested)	rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther	none
Redemption Fees	rr_RedemptionFee	5.00
Exchange Fee	rr_ExchangeFee	none
Account Closeout Fee	rr_MaximumAccountFee	5.00
Management Fees	rr_ManagementFeesOverAssets	0.08%
Other Expenses	rr_OtherExpensesOverAssets	0.03%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.11%
Less Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.03%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	rr_NetExpensesOverAssets	0.08%	[1]
1 Year	rr_ExpenseExampleYear01	113
3 Years	rr_ExpenseExampleYear03	37
5 Years	rr_ExpenseExampleYear05	64
10 Years	rr_ExpenseExampleYear10	143
1 Year	rr_ExpenseExampleNoRedemptionYear01	8
3 Years	rr_ExpenseExampleNoRedemptionYear03	32
5 Years	rr_ExpenseExampleNoRedemptionYear05	59
10 Years	rr_ExpenseExampleNoRedemptionYear10	138
Class A and C Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND | Return Before Taxes | Class A Shares
Risk/Return:	rr_RiskReturnAbstract
Column	rr_AverageAnnualReturnColumnName	Class A Shares (commenced operations on November 14, 2008)
Label	rr_AverageAnnualReturnLabel	Return Before Taxes
Past One Year	rr_AverageAnnualReturnYear01	0.02%
Past Five Years	rr_AverageAnnualReturnYear05	0.48%
Past Ten Years	rr_AverageAnnualReturnYear10	1.62%
Class A and C Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND | Return Before Taxes | Class C Shares
Risk/Return:	rr_RiskReturnAbstract
Column	rr_AverageAnnualReturnColumnName	Class C Shares (commenced operations on November 14, 2008)
Label	rr_AverageAnnualReturnLabel	Return Before Taxes
Past One Year	rr_AverageAnnualReturnYear01	0.02%
Past Five Years	rr_AverageAnnualReturnYear05	0.48%
Past Ten Years	rr_AverageAnnualReturnYear10	1.62%

[1] Gabelli Funds, LLC (the "Manager") has contractually agreed to waive management fees and/or reimburse expenses of the Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding contingent deferred sales loads, interest, acquired fund fees and expenses, taxes, and extraordinary expenses) at no more than 0.08% of the Fund's average daily net assets for Class A and Class C Shares. This arrangement is in effect through January 31, 2014. Thereafter, this arrangement will renew automatically for an additional one-year period, unless the Fund or the Manager provides the other with written notice of termination at least sixty days prior to the expiration of the then current term.

XML

Document and Entity Information	12 Months Ended
	Jan. 28, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Sep. 30, 2012
Registrant Name	GABELLI MONEY MARKET FUNDS
Central Index Key	0000888129
Amendment Flag	false
Document Creation Date	Jan. 28, 2013
Document Effective Date	Jan. 28, 2013
Prospectus Date	Jan. 28, 2013

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	GABELLI MONEY MARKET FUNDS
Prospectus Date	rr_ProspectusDate	Jan. 28, 2013
Document Creation Date	dei_DocumentCreationDate	Jan. 28, 2013

XML

Class A and C Shares | THE GABELLI U.S. TREASURY MONEY MARKET FUND

SUMMARY OF THE FUND

Investment Objective

The Fund seeks to provide high current income consistent with the preservation of principal and liquidity.

Fees and Expenses of the Fund:

This table describes the fees and expenses that you may pay if you buy and hold Class A or Class C Shares of the Fund.

Shareholder Fees (fees paid directly from your investment):

Shareholder Fees Class A and C Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND (USD $)	Class A Shares	Class C Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of redemption or offering price, whichever is lower)	1.00%	1.00%
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (as a percentage of amount invested)	none	none
Redemption Fees	5.00	5.00
Exchange Fee	none	none
Account Closeout Fee	5.00	5.00

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

Annual Fund Operating Expenses Class A and C Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND		Class A Shares	Class C Shares
Management Fees		0.08%	0.08%
Other Expenses		0.03%	0.03%
Total Annual Fund Operating Expenses		0.11%	0.11%
Less Fee Waiver and/or Expense Reimbursement	[1]	(0.03%)	(0.03%)
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement	[1]	0.08%	0.08%

Expense Example

This example is intended to help you compare the cost of investing in shares of 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, that you pay the maximum contingent deferred sales charge (you had exchanged into the Fund when you were still subject to a deferred sales charge), and that the Fund’s operating expenses remain the same (taking into account the expense limitation for one year). Although your actual costs may be higher or lower, based on these assumptions, your costs would be:

Expense Example Class A and C Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND (USD $)	1 Year	3 Years	5 Years	10 Years
Class A Shares	13	37	64	143
Class C Shares	113	37	64	143

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

Expense Example, No Redemption Class A and C Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND (USD $)	1 Year	3 Years	5 Years	10 Years
Class A Shares	8	32	59	138
Class C Shares	8	32	59	138

Principal Investment Strategies

Under normal market conditions, the Fund invests at least 80% of its net assets in U.S. Treasury obligations, including U.S. Treasury bills, U.S. Treasury notes, U.S. Treasury bonds, and U.S. Treasury strips, which have remaining maturities of 397 days or less. Currently, the Fund invests exclusively in such U.S. Treasury obligations.

The Fund is a money market fund managed to meet the requirements of Rule 2a-7 under the Investment Company Act of 1940 (the “1940 Act”). Within these requirements, the Fund will seek to maintain a net asset value of $1.00 per share. Other requirements pertain to the maturity, liquidity and credit quality of the securities in which the Fund may invest. The Fund will only invest in securities which have, or are deemed to have, a remaining maturity of 397 days or less. Also, the dollar-weighted average maturity for all securities contained in the Fund is required to be sixty days or less. In addition, the Fund will limit its dollar-weighted average life (portfolio maturity measured without reference to any maturity shortening provisions of adjustable rate securities by reference to their interest rate reset date) to 120 days.

The investment manager may consider the following factors when buying and selling securities for the Fund: (i) portfolio liquidity and (ii) redemption requests.

You May Want to Invest in the Fund if:

• you desire a fund with lower expenses than the average U.S. Treasury money market fund
• you seek stability of principal more than growth of capital or high current income
• you seek income free from state and local taxes
• you intend to exchange into other Gabelli sponsored mutual funds

Principal Risks

An investment in the Fund is subject to the risk that the Fund’s yield will decline due to falling interest rates. Other factors may affect the market price and yield of the Fund’s securities, including investor demand and domestic and worldwide economic conditions. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any other government agency. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. There is no guarantee that the Fund can achieve its investment objective.

Recently, money market funds have experienced significant pressures from shareholder redemptions and historically low yields on securities they can hold. Therefore, it is possible that a money market fund may no longer be able to value its shares at $1.00.

Performance

The bar chart and table that follow provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, and by showing the Fund’s average annual returns for one year, five years, and ten years. For current 7 day yield information on the Fund, call 800-GABELLI (800-422-3554). As with all mutual funds, the Fund’s past performance does not predict how the Fund will perform in the future. Updated information on the Fund’s results can be obtained by visiting www.gabelli.com.

THE GABELLI U.S. TREASURY MONEY MARKET FUND (Total Returns for the Years Ended December 31)

The bar chart above shows the performance of the Class AAA Shares of the Fund (which are offered in a separate prospectus) for the years ended December 31, 2003, through December 31, 2007, and the period from January 1, 2008, through November 13, 2008; and the performance of the Class A Shares for the period from November 14, 2008, through December 31, 2008, and the years ended December 31, 2009, through December 31, 2012. The historical performance of the Class AAA Shares is used for the periods before the inception of the Class A Shares. Sales loads are not reflected in the above chart. If sales loads were reflected, the Class A performance would be less than those shown.

During the periods shown in the bar chart, the highest return for a quarter was 1.26% (quarter ended December 31, 2006), and the lowest return for a quarter was 0.00% (quarter ended June 30, 2012).

Average Annual Total Returns
(for the periods ended December 31, 2012)

Average Annual Total Returns Class A and C Shares THE GABELLI U.S. TREASURY MONEY MARKET FUND Return Before Taxes	Column	Label	Past One Year	Past Five Years	Past Ten Years
Class A Shares	Class A Shares (commenced operations on November 14, 2008)	Return Before Taxes	0.02%	0.48%	1.62%
Class C Shares	Class C Shares (commenced operations on November 14, 2008)	Return Before Taxes	0.02%	0.48%	1.62%

The returns shown for Class A and Class C Shares prior to their actual inception dates are those of the Class AAA Shares of the Fund (which are offered in a separate prospectus). All Classes of the Fund would have substantially similar annual returns because the shares are invested in the same portfolio of securities and the annual returns would differ only to the extent that the Classes do not have the same expenses.

[1] Gabelli Funds, LLC (the "Manager") has contractually agreed to waive management fees and/or reimburse expenses of the Fund to the extent necessary to maintain the Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement (excluding contingent deferred sales loads, interest, acquired fund fees and expenses, taxes, and extraordinary expenses) at no more than 0.08% of the Fund's average daily net assets for Class A and Class C Shares. This arrangement is in effect through January 31, 2014. Thereafter, this arrangement will renew automatically for an additional one-year period, unless the Fund or the Manager provides the other with written notice of termination at least sixty days prior to the expiration of the then current term.