| Acronym | Definition |
|---|
| OSEP | Office of Special Education Programs (US Department of Education) |
| OSEP | Oratorio Society of Estes Park (Colorado) |
| OSEP | Office of Safety and Environmental Programs |
| OSEP | Occupational Safety and Environmental Programs (US DHS) |
| OSEP | Office of Scientific and Engineering Personnel (National Research Council) |
| OSEP | Optical Science and Engineering Program (University of Colorado at Boulder; Boulder, CO) |
| OSEP | Office of Security and Emergency Preparedness |
| OSEP | Oregonians for Sound Economic Policy |
| OSEP | Operations Standardization Evaluation Program |