| Acronym | Definition |
|---|
| NAA | Newspaper Association of America |
| NAA | National Archives of Australia |
| NAA | Not At All |
| NAA | National Auctioneers Association |
| NAA | National Assessment Agency (UK) |
| NAA | Neutron Activation Analysis |
| NAA | National Autism Association (Nixa, Missouri) |
| NAA | N-Acetyl Aspartate (prominent peak in proton magnetic resonance spectroscopy) |
| NAA | Nucleic Acid Amplification |
| NAA | Naphthaleneacetic Acid |
| NAA | National AfterSchool Association |
| NAA | North American Aviation |
| NAA | National Archery Association |
| NAA | National Aphasia Association |
| NAA | National Arborist Association (now Tree Care Industry Association) |
| NAA | National Aeronautics Association |
| NAA | North Atlantic Assembly (NATO) |
| NAA | National Association of Accountants |
| NAA | Naphthylacetic Acid |
| NAA | Nonattainment Areas |
| NAA | North American Airlines |
| NAA | National Aviation Authority (various locations) |
| NAA | National Aquaculture Association |
| NAA | Narita Airport Authority (Japan) |
| NAA | National Aggregates Association |
| NAA | Native American Arts |
| NAA | Neighborhood Assistance Act |
| NAA | Naperville Astronomical Association |
| NAA | North American Aerospace |
| NAA | National Airports Authority (India) |
| NAA | National Aerosol Association |
| NAA | Network Access Agent |
| NAA | National Aquaculture Act of 1980 |
| NAA | Next Available Agent (Cisco) |
| NAA | National Airworthiness Authorities (Canada) |
| NAA | Not Another Acronym |
| NAA | Not Always Afloat |
| NAA | Neckwear Association of America |
| NAA | National Academy of Arts (Bulgaria) |
| NAA | National Academy on Aging |
| NAA | Newcastle Aviation Academy (UK) |
| NAA | Nevada Artists Association |
| NAA | Notable Achievement Award |
| NAA | National Asphalt Association |
| NAA | Nuclear Accidents Agreement |
| NAA | Network Architecture Assessor (Preventsys) |
| NAA | National Athletic Association |
| NAA | National Apartment Association, Inc. (Washington, DC) |
| NAA | Number Available Agents (Sprint) |
| NAA | Never Again Association (anti-racism group) |