RSF is commonly abbreviated for the Rapid Support Forces, a Sudanese paramilitary force and rebel group in the ongoing civil war in Sudan.

RSF may also refer to:

Groups, organizations

Religious Society of Friends, a Christian religious group, the Quakers Reporters Without Borders (RSF; ) Republican Sinn Féin, a small political party in Ireland Road Safety Foundation in the UK and Ireland Russell Sage Foundation, a philanthropic foundation and publisher

Russian Socialist Federation of the Socialist Party of America

Sports and games Racing Steps Foundation, a UK motorsports support organization Roar Supporters Federation, a fan association for Brisbane Roar FC, Brisbane, Queensland, Australia

Other military organizations Ranger Strike Forces, Kenya Special Forces Regiment Special Force, Sri Lankan Air Force; an elite unit Reserve Strike Force, I Corps (Sri Lanka); a rapid reaction force Rhodesian Security Forces, the military and security forces of the government of former Rhodesia (1964–1980) Royal Scots Fusiliers, former line infantry regiment of the British Army (1678–1959) Rwandan Security Forces, part of the Rwanda Defence Force

Fictional groups Republican Security Forces, a fictional fascist militia in the British science fiction series Doctor Who

Arts, entertainment, media; sports and games Rainbow Serpent Festival, an arts, music and lifestyle festival in Victoria, Australia Referee stopped fight, in boxing Right Said Fred, British music band Royal straight flush, a hand in poker RSF, a French synthesizer manufacturer. See RSF Kobol for an example.

Other uses Rancho Santa Fe, a settlement in California, USA Recovery Support Function, a component of the National Disaster Recovery Framework (NDRF)

Rentable Square Feet, a measure of floor area (building) Resource selection function, in ecology RSF: The Russell Sage Foundation Journal of the Social Sciences

See also