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

• 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)
• Rapid Support Forces, paramilitary forces formerly operated by the government of Sudan
• Republican Security Forces, a fictional fascist militia in the British science fiction series Doctor Who

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)

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