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 Feinthe Irish National Liberation Army (INLA), the paramilitary wing of the IRSMIrish Republican Socialist Prisoners of Warthe Irish Republican Socialist Committees of North America, the representation of the IRSM in North Americathe Republican Socialist Youth Movement, the youth wing of the IRSM