| Abbreviation | Definition |
|---|---|
| OYS | Ohio Youth Symphony |
| OYS | Oregon Youth Summit |
| OYT | Ocean Youth Trust |
| P | President |
| P2PU | Peer 2 Peer University |
| PA | Peace Action |
| PA | Push America |
| PAA | Piedmont Arts Association |
| PAA | Polish American Association |
| PAA | Psoriatic Arthropathy Alliance |
| PAARC | Pacific Association of Artist Run Centres |
| PAATH | Pennsylvania Alliance Against Trafficking in Humans |
| PAC | Pre-Authorized Contribution |
| PACA | Pagans Against Child Abuse |
| PACA | Pakistan American Cultural Association |
| PACA | People Against Car Accidents |
| PACA | Picture Archive Council of America |
| PACCF | Polish American Congress Charitable Foundation |
| PACE | Partnership Action for Continuing Employment |
| PACE | Presidents Award For Chapter Excellence |