In the Philippines, a constitutional convention is one of the three ways to amend the Constitution of the Philippines. Others include a People's Initiative and the Constituent Assembly. Article XVII, Section 3 of the Constitution says, "The Congress may, by a vote of two-thirds of all its Members, call a constitutional convention, or by a majority vote of all its Members, submit to the electorate the question of calling such a convention." The 1987 constitution does not specify how delegates to a Constitutional Convention should be chosen. For past conventions, this has been specified in the legislation calling for the convention. In 1971, under an earlier constitution, Republic Act No. 6132 provided that delegates to a constitutional convention would be elected by the national legislative district, in a special election. The 1987 constitution specifies that any proposed amendments to the 1987 Constitution must be ratified by a majority of voters in a plebiscite. The process of amending or revising the 1987 Constitution has become known as charter change.

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There have been five constitutional conventions in Philippine history: