The Irish Republican Socialist Movement (IRSM) is an umbrella term for:
the Irish Republican Socialist Party (IRSP), a socialist Irish republican group formed in 1974 following a split in Official Sinn Fein
the Irish National Liberation Army (INLA), the paramilitary wing of the IRSM
Irish Republican Socialist Prisoners of War
the Irish Republican Socialist Committees of North America, the representation of the IRSM in North America
the Republican Socialist Youth Movement, the youth wing of the IRSM