| OIAP | Object Independent Authorisation Protocol 
| Others |
| OIAP | Object Independent Authorization Protocol
| Others |
| OIAP | Object-Independent Authorization Protocol
| Others |
| OIAP | Oboukhov Institute of Atmospheric Physics
| Others |
| OIAP | Office of Institutional Analysis and Planning
| Others |
| OIAP | Office of International Admissions and Programs
| Others |
| OIAP | Office of International Agricultural Programs
| Others |
| OIAP | Oklahoma Infants Assistance Program
| Others |
| OIAP | Opportunity for Improvement Assessment Plan
| Others |