RSF may refer to: Entertainment and sports 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. Russian Ski Federation Military Republican Security Forces, a fictional fascist militia in the British science fiction series Doctor Who Rhodesian Security Forces Royal Scots Fusiliers Rapid Support Forces (Sudan) Organizations Religious Society of Friends, the Quakers Reporters Sans Frontières; see: Reporters Without Borders 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 Science and technology Resource selection function, in ecology Other uses Rancho Santa Fe, a settlement in California Recovery Support Function, a component of the National Disaster Recovery Framework (NDRF) Rentable Square Feet, a measure of floor area (building)