| Abbreviation | Definition |
|---|---|
| APAAS | Asia-Pacific Association for the Advancement of Science |
| APAC | Aboriginal Professional Association of Canada |
| APAC | Appointed Professionals Advisory Council |
| APAC | Association of Professional Advisers and Counselors |
| APAC | Australian Partnership for Advanced Computing |
| APAI | Asphalt Pavement Association of Indiana |
| APAI | Association of Paroling Authorities International |
| APAL | Associate Professional Association Leadership |
| APAO | Aggregate Producers Association of Ontario |
| APAO | AgriEnergy Producers' Association of Ontario |
| APAO | Asia Pacific Academy of Ophthalmology |
| APAO | Asia-Pacific Academy of Ophthalmology |
| APAO | Asphalt Pavement Association of Oregon |
| APB | Auditing Practices Board |
| APBA | American Power Boat Association |
| APBA | Associationarlington Police Beneficiary Association |
| APBN | Amigos Profesionales Business Network |
| APCA | All Pakistan Clerks Association |
| APCE | Association Of Presbyterian Church Educators |
| APCE | Association Poitou Charentes Europe |