The Workers' Socialist Party (Spanish: Partido Socialista de Trabajadores, or PST) was a leftist political party in Chile that existed between 1940 and 1944.
They were known as nonconformists, as they did not want to continue supporting the government of Pedro Aguirre Cerda and the Popular Front.
In spite of this, they were integrated to the Democratic Alliance of Chile.
Among its members were César Godoy Urrutia, Carlos Muller, Emilio Zapata Díaz, Carlos Rosales, Natalio Berman and Jorge Dowling.
Also included was the secretary general of the Socialist Youth Federation, Orlando Millas.