Revolutionary Socialist Party (in Spanish: Partido Socialista Revolucionario), was a political party in Peru formed in November 1976 by a group of radical army officers who had been active in the "first phase of the revolution" under Velasco Alvarado and who subsequently advocated a return to the objectives of the 1968 coup.

[2] The party's founders included several people from the Velasco Alvarado government, such as general Leónidas Rodríguez Figueroa, general Jorge Fernández Maldonado, Enrique Bernales Ballesteros and Alfredo Filomeno.

[3] The PSR was founded for the purpose of participating in the 1978 elections for the Constituent Assembly and won 6 of the 100 seats.

The PSR-ML played a dominant role in what was left of the National Agrarian Confederation, which had been set up by Avelino Mar during the Velasco Alvarado administration.

In the 2011 Peruvian general election, the party took part in the successful Peru Wins alliance of Ollanta Humala.