| Acronym | Definition |
|---|
| NASA | National Aeronautics and Space Administration (USA) |
| NASA | National Auto Sport Association |
| NASA | National Aeronautics and Space Act |
| NASA | North America South America |
| NASA | Native American Student Association |
| NASA | National Aeronautics and Space Agency |
| NASA | Nahverkehrsservice Sachsen-Anhalt (German: Saxony-Anhalt local traffic service) |
| NASA | Never a Straight Answer |
| NASA | Need Another Seven Astronauts |
| NASA | National Academy of Sciences of Armenia |
| NASA | North American Saxophone Alliance |
| NASA | National Association of Student Anthropologists (est. 1985) |
| NASA | Not Another Stupid Acronym |
| NASA | Natural Athlete Strength Association |
| NASA | National Association of State Archaeologists |
| NASA | National Association of Sentencing Advocates |
| NASA | National Association of Students of Architecture (India) |
| NASA | Network Affiliated Stations Alliance |
| NASA | Non-Academic Staff Association (Canadian universities) |
| NASA | Native American Student Affairs |
| NASA | National Association of Signing Agents |
| NASA | North Andover Soccer Association (Massachusetts) |
| NASA | Nice And Safe Attitude (UK) |
| NASA | Norepinephrine Antagonist Serotonin Antagonist (antidepressant) |
| NASA | Nauru Australian Soccer Association (est. 1973) |
| NASA | North Atlanta Swim Association (Georgia) |
| NASA | National Autograss Sports Association (UK) |
| NASA | North American Sankethi Association |
| NASA | National Appliance Service Association (Kokomo, IN) |
| NASA | Non-Active Side Arm (oilfield) |
| NASA | North Austin Soccer Association (Austin, TX) |
| NASA | North American Shippers Association |
| NASA | Newspaper Advertising Sales Association |
| NASA | Northern Alberta Institute of Technology Academic Staff Association (Canada) |
| NASA | New Advanced Search Agent |
| NASA | National Advertising Sales Association |
| NASA | National Association of Special Agents |
| NASA | Nyenrode Alumni Summer Academy |
| NASA | Nepal Animal Science Association |
| NASA | Nursing Association of South Australia |
| NASA | Northmemorial Amateur Sports Association (Canada) |
| NASA | Normal Atmosphere Safety Approval |
| NASA | National Acronym Slingers Association :-) |
| NASA | Norfolk and Suffolk Animal Trust (UK) |
| NASA | National African Students Association, LLC (est. 2007) |
| NASA | Nucleo de Afirmacion del Saber Andino (Spanish: Core Andean Affirmation of Knowledge; Peru) |
| NASA | Navy Alpine Snowsports Association (Australia) |
| NASA | Never Access Space Again (slang) |