RSF
- Brisbane Roar FC
- I Corps (Sri Lanka)
- Kenya Special Forces
- National disaster recovery framework
- RSF Kobol
- Racing Steps Foundation
- Rainbow Serpent Festival
- Rancho Santa Fe
- Rapid Support Forces
- Regiment Special Force
- Religious Society of Friends
- Reporters Without Borders
- Republican Security Forces
- Republican Sinn Féin
- Resource selection function
- Rhodesian Security Forces
- Right Said Fred
- Road Safety Foundation
- Royal Scots Fusiliers
- Russell Sage Foundation
- Russian Socialist Federation
- Rwanda Defence Force