Supplement to the

Fidelity^® Massachusetts Municipal Money Market Fund

Fidelity Massachusetts AMT Tax-Free Money Market Fund and

Fidelity Massachusetts Municipal Income Fund

Funds of Fidelity Massachusetts Municipal Trust

STATEMENT OF ADDITIONAL INFORMATION

March 31, 2008

The following information supplements similar information found in the "Management Contracts" section on page 54.

Sub-Adviser - FMR U.K. On behalf of each fund, FMR has entered into a sub-advisory agreement with FMR U.K. Pursuant to the sub-advisory agreement, FMR may receive from the sub-adviser investment research and advice on issuers outside the United States (non-discretionary services) and FMR may grant the sub-adviser investment management authority and the authority to buy and sell securities if FMR believes it would be beneficial to the funds (discretionary services). FMR, and not the funds, pays the sub-adviser.

<R>Sub-Advisers - FMR H.K. and FMR Japan. On behalf of each fund, FMR has entered into sub-advisory agreements with FMR H.K. and FMR Japan. Pursuant to the sub-advisory agreements, FMR may receive from the sub-advisers investment research and advice on issuers outside the United States (non-discretionary services) and FMR may grant the sub-advisers investment management authority and the authority to buy and sell securities if FMR believes it would be beneficial to the funds (discretionary services). FMR, and not the funds, pay the sub-advisers.</R>

For the money market funds, the following information replaces the similar information found in the "Fund Holdings Information" section beginning on page 63.

Each fund may from time to time make full holdings available more frequently, including daily, if such disclosure is determined by FMR to be in the interest of fund shareholders. A fund may also from time to time provide or make available to third parties upon request specific fund level performance attribution information and statistics, or holdings information with respect to a specific security or company. Third parties may include fund shareholders or prospective fund shareholders, members of the press, consultants, and ratings and ranking organizations.

<R>MASB-08-03 October 30, 2008
1.475751.119</R>

Supplement to the

Fidelity^® Massachusetts AMT Tax-Free Money Market Fund

A Fund of Fidelity Massachusetts Municipal Trust

Institutional Class and Service Class

STATEMENT OF ADDITIONAL INFORMATION

March 31, 2008

<R>The following information supplements similar information found in the "Management Contract" section beginning on page 44.</R>

<R>Sub-Advisers - FMR H.K. and FMR Japan. On behalf of the fund, FMR has entered into sub-advisory agreements with FMR H.K. and FMR Japan. Pursuant to the sub-advisory agreements, FMR may receive from the sub-advisers investment research and advice on issuers outside the United States (non-discretionary services) and FMR may grant the sub-advisers investment management authority and the authority to buy and sell securities if FMR believes it would be beneficial to the fund (discretionary services). FMR, and not the fund, pays the sub-advisers.</R>

Sub-Adviser - FMR U.K. On behalf of the fund, FMR has entered into a sub-advisory agreement with FMR U.K. Pursuant to the sub-advisory agreement, FMR may receive from the sub-adviser investment research and advice on issuers outside the United States (non-discretionary services) and FMR may grant the sub-adviser investment management authority and the authority to buy and sell securities if FMR believes it would be beneficial to the fund (discretionary services). FMR, and not the fund, pays the sub-adviser.

The following information replaces the similar information found in the "Fund Holdings Information" section beginning on page 51.

The fund may from time to time make full holdings available more frequently, including daily, if such disclosure is determined by FMR to be in the interest of fund shareholders. A fund may also from time to time provide or make available to third parties upon request specific fund level performance attribution information and statistics, or holdings information with respect to a specific security or company. Third parties may include fund shareholders or prospective fund shareholders, members of the press, consultants, and ratings and ranking organizations.

<R>MAA/MASCB-08-03 October 30, 2008
1.872068.102</R>