| Acronym | Definition |
|---|
| OAPI➣OPUS (Operational Pipeline System) Application Programming Interface |
| OAPI➣Otsuka America Pharmaceutical, Inc. (est. 1989; Rockville, MD) |
| OAPI➣Organisation Africaine de la Propriété Intellectuelle |
| OAPI➣Open Access Point Initiative (Trapeze Networks) |
| OAPI➣Ohio Association of Plumbing Inspectors (Huron, OH) |