The South Armagh Republican Action Force (SARAF) shortened simply to the Republican Action Force (RAF) for a small number of attacks in Belfast was an Irish republican paramilitary group that was active from September 1975 to April 1977 during the Troubles in Northern Ireland. Its area of activity was mainly the southern part of County Armagh. According to writers such as Ed Moloney and Richard English, it was a cover name used by some members of the Provisional IRA South Armagh Brigade. The journalist Jack Holland, alleged that members of the Irish National Liberation Army (INLA) were also involved in the group. During the same time that the South Armagh Republican Action Force was active the INLA carried out at least one sectarian attack that killed Protestant civilians using the covername "Armagh People's Republican Army". According to Malcolm Sutton's database at CAIN, the South Armagh Republican Action Force was responsible for 24 deaths during the conflict, all of whom were classified as civilians.

The South Armagh Brigade of the Provisional Irish Republican Army (IRA) operated during the Troubles in south County Armagh. It was organised into two battalions, one around Jonesborough and another around Crossmaglen. By the 1990s, the South Armagh Brigade was thought to consist of about 40 members, roughly half of them living south of the border. It has allegedly been commanded since the 1970s by Thomas 'Slab' Murphy who is also alleged to be a member of the IRA's Army Council. Compared to other brigades, the South Armagh IRA was seen as an 'independent republic' within the republican movement, retaining a battalion organizational structure and not adopting the cell structure the rest of the IRA was forced to adopt after repeated intelligence failures.