| Acronym | Definition |
|---|
| NAC | Network Access Control/Controller |
| NAC | Network Admission Control (Cisco) |
| NAC | National Arts Centre (Ottawa, Canada) |
| NAC | N-Acetylcysteine |
| NAC | National Advisory Committee |
| NAC | National Advisory Council |
| NAC | North Atlantic Council (NATO) |
| NAC | Nevada Administrative Code |
| NAC | National Arts Council |
| NAC | Net Access Corporation |
| NAC | National Aids Council (WHO) |
| NAC | National Adjudicatory Council |
| NAC | National Agency Check |
| NAC | National Action Committee (on the Status of Women) |
| NAC | New Apostolic Church |
| NAC | National Alliance for Caregiving |
| NAC | National Archives of Canada |
| NAC | NASA Advisory Council |
| NAC | Native American Church |
| NAC | National Acquisition Center (DVA) |
| NAC | National Agroforestry Center |
| NAC | Nunavut Arctic College (Candada) |
| NAC | Naturist Action Committee (The Naturist Society) |
| NAC | National Asthma Council (Australia) |
| NAC | National Ability Center (Park City, Utah) |
| NAC | Notification Appliance Circuit |
| NAC | National Association of Counties (Washington, DC) |
| NAC | National Accreditation Commission |
| NAC | North American Cup (US Fencing Association) |
| NAC | National Adoption Center |
| NAC | Neuro-Associative Conditioning (Anthony Robbins) |
| NAC | National Asthma Campaign (South Melbourne, VIC, Australia) |
| NAC | North Atlantic Current |
| NAC | Neoadjuvant Chemotherapy |
| NAC | New Adult Contemporary (music genre) |
| NAC | Network Applications Consortium |
| NAC | Network Access Server (Microsoft) |
| NAC | National Advocacy Center |
| NAC | National Academy of Construction |
| NAC | Nursing Assistant Certified |
| NAC | North American College |
| NAC | Network Administration Center |
| NAC | Neighborhood Advisory Council |
| NAC | National Addiction Centre |
| NAC | Novice Agility Certificate (Dog Agility Title) |
| NAC | Network Access Code |
| NAC | North Ayrshire Council |
| NAC | Noad Advendo Combinatie (Dutch soccer team) |
| NAC | Newport Aquatic Center |
| NAC | Nepal Airlines Corporation |
| NAC | National AIDS Clearinghouse (US CDC) |
| NAC | National Aquaculture Council |
| NAC | Not A Citizen |
| NAC | National Accreditation Commission for Early Care and Education Programs |
| NAC | National Association of Concessionaires |
| NAC | Network Access Corporation |
| NAC | Natural Area Codes (geographic coordinates) |
| NAC | NASA Advisory Committee |
| NAC | North American Challenge |
| NAC | National Association of Collectors |
| NAC | Network Analysis Corporation |
| NAC | National Asbestos Council |
| NAC | National Automobile Club |
| NAC | Nonproliferation and Arms Control |
| NAC | Null Attachment Concentrator |
| NAC | Not A Chain |
| NAC | National Association for Continence |
| NAC | North Atlantic Coast |
| NAC | Network Access Computer (Sprint) |
| NAC | Northport Arts Coalition (Northport, NY) |
| NAC | National Administrator's Credential |
| NAC | Naval Air Crewman |
| NAC | New Apprentice Centre |
| NAC | Navy Arms Company |
| NAC | National Association of Cities |
| NAC | National Agricultural Center (UK) |
| NAC | Noritsu America Corporation |
| NAC | Network Access Component |
| NAC | Northern Air Command (Pakistan Air Force) |
| NAC | National Audience Composition |
| NAC | Nuveen CA Dividend Advantage Municipal Fund (stock symbol) |
| NAC | Net Advertising Circulation |
| NAC | Naval Administrative Command |
| NAC | NetAbility Corp. |
| NAC | Navy Activity Control |
| NAC | Neutral Adaptive Controller |
| NAC | Non-Area Code |
| NAC | Nation of Asiatic Communists |
| NAC | National Activation Center |
| NAC | Navy Advanced Concept |
| NAC | Normal Approach Course |
| NAC | Nußdorfer Athletik Club |
| NAC | Neutral Access Point |
| NAC | North American Computers, Inc. |
| NAC | National Automobile/Automotive Center |
| NAC | Naval Avionics/Air Center |
| NAC | Navy Acquisition Circular |
| NAC | Network Assignment Center (Nortel) |
| NAC | National Association of Commodores |