| Acronym | Meaning |
| PAC | Pacific |
| PAC | Pacific Air Command |
| PAC | Pacific Area Command |
| PAC | Pakistan Aeronautical Complex (Kamra, Pakistan) |
| PAC | Pan-Africanist Congress (South Africa) |
| PAC | Participant Advisory Committee |
| PAC | Participating Associate Contractor |
| PAC | Partido Acción Ciudadana (Citizen Action Party, Costa Rica) |
| PAC | Passive Acoustic Classification |
| PAC | Past Award Conference |
| PAC | Patent Assistance Center (USPTO) |
| PAC | Patient Airlift Center (USAF) |
| PAC | Patriot Advanced Capability |
| PAC | Patriot Anti Capability |
| PAC | Pentagon Athletic Club |
| PAC | Personal Access Communication |
| PAC | Personnel Actions Command (US Army) |
| PAC | Personnel Administration Center |
| PAC | Personnel and Administrative Center |
| PAC | Pilot At Controls |
| PAC | Plan d'Accompagnement des Chômeurs (French: Plan to Assist the Unemployed; Belgium) |
| PAC | Police Assistance Centre (Australia) |
| PAC | Politica Agricola Comune (Italian: Common Agricultural Policy / European Commission, aka: CAP) |
| PAC | Pollution Abatement and Control (various organizations) |
| PAC | Post Award Conference |
| PAC | Postauthorization Change (USACE) |
| PAC | Potentially Adverse Condition |
| PAC | Power Assisted Combatant |
| PAC | Power Assurance Check |
| PAC | Pre-Application Conference (various locations) |
| PAC | Pre-Assigned Access Code (Washington State Department of Revenue) |
| PAC | Preliminary Acceptance Certificate |
| PAC | Prevention Advisory Committee (various organizations) |
| PAC | Prevention of Armed Conflict |
| PAC | Price Adjustment Code |
| PAC | Primary Address Code |
| PAC | Primary Agency Committee (US FEMA) |
| PAC | Princess Anne County (VIrginia) |
| PAC | Problem Action Center |
| PAC | Problem Animal Control (Massachusetts) |
| PAC | Proceedings Authorization Committee (Ontario, Canada) |
| PAC | Procurement Assistance Center |
| PAC | Procurement, Acquisition and Construction (NOAA Appropriation Account) |
| PAC | Production Acceptance Certification |
| PAC | Production Acquisition Cost |
| PAC | Professional Advancement Course |
| PAC | Professional and Administrative Career |
| PAC | Program Acquisition Cost |
| PAC | Programa de Aceleração do Crescimento (Portuguese: Growth Acceleration Program; Brazil) |
| PAC | Project Approval Committee |
| PAC | Proprietary Article Certificate (India) |
| PAC | Prosecutors Advisory Council |
| PAC | Provider Advisory Committee |
| PAC | Provincial Armed Constabulary (India) |
| PAC | Public Access Center |
| PAC | Public Accounts Committee (UK) |
| PAC | Public Advisory Committee |
| PAC | Public Archives of Canada |
| PAC | Public Art Commission (various locations) |
| PAC | Public Assistance Coordinator (US FEMA) |
| PAC | Puntland AIDS Commission (Somalia) |