Other
- SFL, refers to Solderfield Financial System
- Saskatchewan Federation of Labour, a Canadian trade union federation
- Sexual Freedom League, a California swingers association from the 60's
- South Florida, the metropolitan South Florida area
- Students For Liberty, a student run and student focused libertarian non-profit organization based in Washington D.C.
- SFL (programming language), or System Function Language, of the ICL VME operating system
- Systemic functional linguistics or systemic functional grammar
- Scissors for Lefty, an indie rock band from San Francisco
- Stiff Little Fingers, a punk rock band from Northern Ireland
- S/MIME Freeware Library
- Sci-Fi-London, a Film Festival in London, England
- Svenska Frimurare Lägret (English: Swedish Masonic Camp), a masonic organization
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