OSFL
| Acronym | Definition |
|---|---|
| OSFL | Olive-Sided Flycatcher (bird species; Contopus cooperi) |
| OSFL | Old School for Life |
| OSFL | Organización Sin Fines de Lucro (Spanish: Not-for-Profit Organization) |
| OSFL | Orchestra of the Southern Finger Lakes (Corning, NY) |
| OSFL | Olympian Sunday Football League (UK) |
| OSFL | Office Supplies for Less |
| OSFL | Operation Sports Football League (gaming) |