Socialist Workers Party (in Spanish: Partido Socialista de los Trabajadores, or PST) is a Trotskyist political party in Peru.
In 1980, PST had its candidates on the lists of PRT.[1] On March 7, 1982, the majority wing of the Revolutionary Marxist Workers Party (POMR), led by Senator Ricardo Napurí, merged into PST.[1]
PST is a member of LIT-CI. It publishes Bandera Socialista.
In 1992, PST split, and a group adhering to UIT-CI formed a parallel PST.