English abbreviations from naak to naca
- NAAK (Mark I NAAK, Nerve Agent Antidote Kit)
- NAAL (Norton Anthology of American Literature)
- NAAMA (National Association Of Ancient And Medieval Arts)
- NAANSD (National Association of Anorexia Nervosa and Associated Disorders)
- NAAQS (National Ambient Air Quality Standards)
- NAAR (National Alliance for Autism Research)
- NAARS (Nottingham Anti-Animal Racing Society)
- NAASCA (National Association of Adult Survivors of Child Abuse)
- NAAWP (National Advancement Association of White People)
- NAAWS (NATO Anti-Air Warfare System)
- NAB (Native Acrylamide Bis)
- NABA (North American Broadcasters Association)
- NABCI (North American Bird Conservation Initiative ("nab-see"))
- NABE (National Association of Bilingual Education)
- NABET (National Association of Broadcast Employees and Technicians)
- NABO (North American Boxing Organization)
- NABR (North American Bavarian Racing)
- NABSW (National Association of Black Social Workers)
- NABT (National Association of Biology Teachers)
- NABTS (North American Broadcast Teletext Specification)
- NABV (National Association for Black Veterans)
- NAC (Network access control)
- NACA ((U.S.) National Advisory Committee for Aeronautics (1915–1958, became NASA))