NAC
- CA Oradea
- GalNAc
- GlcNAc
- Knack (disambiguation)
- List of country groupings
- N-Acetylcarnosine
- N-Acetylcysteine
- NAC Air
- NAC Architecture
- NAC Basketbal
- NAC Breda
- NAC Fieldmaster
- NAC Stadion
- NAC TV
- NACS (disambiguation)
- Nach (disambiguation)
- Nacional Atlético Clube (disambiguation)
- Nack (disambiguation)
- Nak (disambiguation)
- Nakanihon Automotive College
- Nakh (disambiguation)
- Nam Cheong station
- Namibia Airports Company
- Nanjing Automobile (Group) Corporation
- Naracoorte Airport
- Narodowe Archiwum Cyfrowe
- Nashville Athletic Club
- National Aboriginal Conference
- National Abortion Campaign
- National Academy of Construction
- National Action Committee on the Status of Women
- National Administrative Council
- National Advisory Council
- National Agricultural Centre
- National Air Communications
- National Airways Corporation (South Africa)
- National Aquatic Centre
- National Arts Centre
- National Arts Club
- National Arts Council, Singapore
- Native American Church
- Natural Area Code
- Nauru Air Corporation
- Netherlands Antilles Championship
- Network Access Code
- Network Admission Control
- Network access control
- New Administrative Capital
- New Agenda Coalition
- New Apostolic Church
- New Atlantic Charter
- New Zealand National Airways Corporation
- New adult contemporary
- Newspaper Agency Corporation
- Nickel Asia Corporation
- Nordic Aviation Capital
- North American Communications
- North American Confederacy
- North Atlantic Conference
- North Atlantic Council
- North Atlantic Current
- Northern Air Cargo
- Northern Athletics Conference
- Notified Area Council
- Nowra Anglican College
- Nucleus accumbens
- Nunavut Arctic College
- Nyasaland African Congress
- Pontifical North American College
- Royal Nepal Airlines Corporation