Constituent Assembly elections were carried out in Portugal on 25 April 1975, exactly one year after the Carnation Revolution. The election elected all 250 members of the Portuguese Constituent Assembly.

The Carnation Revolution, also known as the 25 April, was a military coup by military officers that overthrew the authoritarian Estado Novo government on 25 April 1974 in Lisbon, producing major social, economic, territorial, demographic, and political changes in Portugal and its overseas colonies through the Processo Revolucionário Em Curso. It resulted in the Portuguese transition to democracy and the end of the Portuguese Colonial War.