OAPI
| 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) |