Irish Republican Socialist Movement

• the Irish Republican Socialist Party, a socialist Irish republican group formed in 1974 following a split in Official Sinn Fein
• the Irish National Liberation Army, 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