OSEF
| 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) |