SFL
- Geo Super Football League
- Saskatchewan Federation of Labour
- Scandinavian Ferry Lines
- Sci-Fi-London
- Scottish Football League
- Serbian First League
- Southern Football League
- Southern Football League (Scotland)
- Southern Football League (South Australia)
- Southern Football League (Tasmania)
- Southern Football League (Victoria)
- Soviet First League
- Spring Football League
- Stars Football League
- Students for Liberty
- Sunday Football League (1984–2008)
- Sunday Football League (Lithuania)
- Super Fight League
- Swedish Futsal League
- Swiss Football League
- Systemic functional linguistics