| NASA | Nacional Automotriz Sa 
| Others |
| NASA | Narcissistic A**hole Science Association
| Others |
| NASA | National Acronym Slinging Agency
| Others |
| NASA | National Aeronautics and Space Administration
| Organization |
| NASA | National Aggregate Stone Association
| Others |
| NASA | National Air and Space Administration
| Others |
| NASA | National Air and Space Association
| Others |
| NASA | National Airplane Space Airplane
| Others |
| NASA | National Anal Sex Association
| Others |
| NASA | National Annoying Sister Association
| Others |
| NASA | National Army Sporting Association
| Others |
| NASA | National Assistance Services Australia
| Others |
| NASA | National Association of Signing Agents
| Others |
| NASA | National Association of Space Astronauts
| Others |
| NASA | National Association of Students of Architecture
| Others |
| NASA | National Auto Sport Association
| Others |
| NASA | National Autograss Sports Association
| Others |
| NASA | National School of Aesthetics
| Others |
| NASA | Natural Athlete Strength Association
| Others |
| NASA | Nautical Acrobatic Stunts Association
| Others |
| NASA | Navy Alpine Snowsports Association
| Others |
| NASA | Need Another Seven Astronauts
| Others |
| NASA | Negative Attitudes Scuttle Astronautics
| Others |
| NASA | Negotiating Agents Steering API
| Others |
| NASA | Nepal Automobile Sport Association
| Others |
| NASA | Nerds And Scrubs Association
| Others |
| NASA | Nerds Are Searching for Answers
| Others |
| NASA | Nerds Arranging Space Adventures
| Others |
| NASA | Never A Straight Answer
| Others |
| NASA | Never Absolutely Sure of Anything
| Others |
| NASA | Never Admit Seeing Anything
| Others |
| NASA | Never Any Satisfying Answers
| Others |
| NASA | New Age Space Association
| Others |
| NASA | New Airwalk Shoes Accepted
| Others |
| NASA | Nice and safe attitude
| Others |
| NASA | No Access to Space Allowed
| Others |
| NASA | No Access to Space for Americans
| Others |
| NASA | No Aliens Seen Anywhere
| Others |
| NASA | No Anti Sock Anvil
| Others |
| NASA | Noodle Arrangement Society of America
| Others |
| NASA | North American Saxophone Alliance
| Others |
| NASA | North American Search Authority
| Others |
| NASA | North American Special Agency
| Others |
| NASA | North American Sysop Alliance
| Others |
| NASA | North Atlantic Space Administration
| Others |
| NASA | Northmemorial Amateur Sports Association
| Others |
| NASA | Nosey Alien Seekers Association
| Others |
| NASA | Not A Shuttle Anymore
| Others |
| NASA | Not All Shuttles Arrive
| Others |
| NASA | Not Another Spaceship Aahh
| Others |