| Acronym | Definition |
|---|
| OSEF➣On S'En Fout (French: We Don't Care) |
| OSEF➣Open Source Education Foundation (Tucson, AZ) |
| OSEF➣Ozarks Science and Engineering Fair (Missouri) |
| OSEF➣Open Space with Earth Floor (animal studies) |
| OSEF➣Object-Oriented Software Engineering Flow |
| OSEF➣Oakland Schools Education Foundation (Oakland, CA) |
| OSEF➣Ontario Student Exchange Foundation (Canada) |