The Constitution of the Federated States of Micronesia is the supreme law of the Federated States of Micronesia. It was adopted in 1979.

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Constitutional drafting began in June 1975. It was ratified on October 1, 1978, and took effect on May 10, 1979; May 10 is celebrated as Constitution Day. The constitution has been amended once, in 1990.^[1]

The constitution is based on that of the United States, Micronesia's former trustee. It provides for a separation of powers between the executive, legislative, and judicial branches, as well as a federal system.

However, unlike the United States, Micronesia has a unicameral legislature, called the National Congress, with fourteen senators. Four of them represent the four states for four-year terms, and the other ten representatives apportioned by population and serve two-year terms. Also, the National Congress is responsible for electing the President and Vice President.^[2] Most government functions other than foreign policy and national defense are carried out by the State governments. The constitution prohibits non-citizens from owning land in FSM.^[3]