| Acronym | Definition |
|---|
| NOSA | NASA Open Source Agreement |
| NOSA | National Occupational Safety Association (South Africa) |
| NOSA | Newport Ocean Sailing Association (Newport Beach, CA) |
| NOSA | National Oil Shale Association (Glenwood Springs, CO) |
| NOSA | National Office for Summative Assessment (for General Practice Training, University of Winchester, UK) |
| NOSA | NOAA Observing System Architecture |
| NOSA | New Orleans Soccer Academy |
| NOSA | Nordic Society for Aerosol Research |
| NOSA | National Optometric Student Association |
| NOSA | North Okanagan Sailing Association (British Columbia, Canada) |
| NOSA | Northern Outlaw Sprint Association |
| NOSA | Notice of Solicitation of Applications |
| NOSA | Non Organ Specific Autoantibodies |
| NOSA | Nokian Seudun Ampujat |
| NOSA | National Office of Samoan Affairs (Carson, California) |
| NOSA | North Saanich Dog Obedience Training Club (Canada) |
| NOSA | Neuro-Ophthalmology Society of Australia |
| NOSA | Naval Officers' Spouses' Association |
| NOSA | Non-Smokers Association (India) |
| NOSA | New Orleans Straight Ahead (band) |
| NOSA | National Ocean Sciences Accelerator |
| NOSA | New Orleans Sports Arena |
| NOSA | Notice of Special Assessment |
| NOSA | NATO OSI Security Architecture |
| NOSA | Namasagali Old Students Association (Uganda) |
| NOSA | Notice of Service Availability |
| NOSA | Nigerian Optometric Students Association (University of Benin; Nigeria) |
| NOSA | Netlabs OpenSource Archive |
| NOSA | NATO Open Systems Architecture |
| NOSA | NATO Open Security Architecture |
| NOSA | Nalanda Old Scout Association |
| NOSA | National Omnibus Services Authority (Ghana) |
| NOSA | notice of service acceptance |
| NOSA | Network Operations Service Acceptance |
| NOSA | Novaliches San Agustin |
| NOSA | Notice of Service Activation |
| NOSA | Neons Of San Antonio (Texas Dodge Neon owners group) |