LI Legislature of the Mexican Congress in the context of 1976 Mexican general election

General elections were held in Mexico on 4 July 1976. José López Portillo was the only candidate in the presidential election, and was elected unopposed. In the Chamber of Deputies election, the Institutional Revolutionary Party (PRI) won 195 of the 237 seats, as well as winning 64 seats in the Senate election. Voter turnout was 65% in the Senate election and 62% in the Chamber election.

The deputies elected served during the 50th session of Congress (1976 to 1979), while the senators additionally served during the 51st session (1979–1982).