The Workers' Socialist Movement (Spanish: Movimiento Socialista de los Trabajadores, MST) is a Trotskyist political party in Argentina.

[1] The MST was founded in 1992 as a split from another Trotskyist group, the Movement Towards Socialism (see Nahuel Moreno).

[2] The MST is active on a number of college campuses, including the University of Buenos Aires.

The minority founded a new organization, named Socialist Left.

This article about an Argentine political party is a stub.