| Abbreviation | Definition |
|---|---|
| PAC | Pacific |
| PAC | Pakistan Aeronautical Complex |
| PAC | Patriot Advanced Capability |
| PAC | Perfect Authentic Cadence |
| PAC | Personnel and Administration Center |
| PAC | Political Action Committee |
| PAC | Project Advisory Committee |
| PAC-2 | Patriot Anti-Tactical Missile Capability-2 |
| PAC-3 | Patriot Advanced Capability-3 |
| PACA | Procuring Authority Competition Advocate |
| PACAF | PACific Air Forces |
| PACAF | PACific United States Air Force |
| PACAREA | Pacific Area |
| PACCS | Prospective Army Coronary Calcium Study |
| PACE | Program Acquisition Cost Estimate |
| PACFLT | Pacific Fleet |
| PACK | Packaging, Handling, Storage, and Transportation Data Item Description category |
| PACO | Pacific Islander/ Samoan |
| PACO | Provost's Advisory Committee On .... |
| PACOM | Pacific Command |