| Acronym | Definition |
|---|
| NSA➣National Security Agency (US government) |
| NSA➣Naval Support Activity |
| NSA➣National Speakers Association |
| NSA➣No Strings Attached |
| NSA➣Naczelny Sad Administracyjny (Polish: Supreme Administrative Court) |
| NSA➣Network Security Appliance (Sonicwall) |
| NSA➣Notary Signing Agent |
| NSA➣National Security Advisor |
| NSA➣Not Seasonally Adjusted |
| NSA➣National Security Archive |
| NSA➣Non-Stand Alone (5G solution) |
| NSA➣National Security Act |
| NSA➣Non-Standard Auto (insurance) |
| NSA➣National Society of Accountants |
| NSA➣National Sheriffs' Association (Alexandria, VA, USA) |
| NSA➣Network Systems Administrator (various organizations) |
| NSA➣National Security Affairs |
| NSA➣National Snow Analyses (US NOAA) |
| NSA➣National Sports Academy (various locations) |
| NSA➣Network Security Administrator |
| NSA➣Network Storage Appliance (computing) |
| NSA➣No Sugar Added |
| NSA➣National Space Agency |
| NSA➣National Stuttering Association |
| NSA➣Netserver Assistant |
| NSA➣Non Service Affecting |
| NSA➣National Security Agency |
| NSA➣Network Service Agent |
| NSA➣Norton System Administrator |
| NSA➣Next Station Addressing |
| NSA➣Network Supported Accounts |
| NSA➣National Supervisory Authority (EU) |
| NSA➣National Stroke Association |
| NSA➣Network Spinal Analysis |
| NSA➣National Spiritual Assembly (Institution of the Baha'i Faith) |
| NSA➣National Survey of Adolescents |
| NSA➣Norwegian Shipowners’ Association |
| NSA➣North Slope of Alaska |
| NSA➣National Sheep Association (Malvern, Worcestershire, UK) |
| NSA➣New Small Airplane (Boeing) |
| NSA➣National Safety Associates |
| NSA➣National Scrabble Association |
| NSA➣Non-State Actor (international relations) |
| NSA➣Nippon Surfing Association (Japan) |
| NSA➣National Student Association |
| NSA➣North Star Academy |
| NSA➣Need Special Assistance |
| NSA➣National Smokejumper Association |
| NSA➣New Saint Andrews College (Moscow, Idaho) |
| NSA➣National Sunflower Association |
| NSA➣Network Security Agreement |
| NSA➣New Student Ambassadors (various schools) |
| NSA➣National Stone Association (Washington, DC) |
| NSA➣Native Speakers of Arabic |
| NSA➣National Stereoscopic Association |
| NSA➣Negative Security Assurances |
| NSA➣National Steeplechase Association |
| NSA➣National Sound Archive |
| NSA➣National Security Area |
| NSA➣NATO Standardization Agency |
| NSA➣National Smokers Alliance |
| NSA➣Nebraska Statewide Arboretum |
| NSA➣Non Standard Ammunition (munitions) |
| NSA➣National Statistical Authorities (EU) |
| NSA➣Nordic Securities Association (est. 2008) |
| NSA➣Negotiated Service Agreement (US postal service) |
| NSA➣National Security Agents (gaming clan) |
| NSA➣No Secrets Association |
| NSA➣Non-Standard Analysis |
| NSA➣New Settlement Apartments (New York, NY) |
| NSA➣Neil Stewart Associates (UK) |
| NSA➣National Seniors Australia (est. 1976) |
| NSA➣Nuclear Science Abstracts |
| NSA➣Normalized Site Attenuation |
| NSA➣Nashville School of the Arts (Tennessee) |
| NSA➣National Storytelling Association |
| NSA➣Natural Systems Agriculture |
| NSA➣Network Simplex Algorithm |
| NSA➣National Slag Association (Alexandria, VA) |
| NSA➣Non-Self-Aligned |
| NSA➣Northern Study Area |
| NSA➣Navy Support Activity |
| NSA➣National Skateboard Association |
| NSA➣Noise Sensitive Area |
| NSA➣Nikkei Stock Average |
| NSA➣National Shipping Authority |
| NSA➣National School of Administration (China) |
| NSA➣Non-surgical Sperm Aspiration |
| NSA➣Nunavut Settlement Area |
| NSA➣New Statistical Account (Reports on the conditions of Scotland, with reports on each parish, in the 1830s) |
| NSA➣Nouvelle Substance Active (French: New Active Substance; Canada) |
| NSA➣National Supers Agency (fictional from the movie The Incredibles) |
| NSA➣National Safety Association |
| NSA➣National Security Anarchists (hacker group) |
| NSA➣National Sprint Association (UK) |
| NSA➣Natuurwetenschappelijke Studievereniging Amsterdam (University of Amsterdam Physics Department student organization) |
| NSA➣Nebraska Soybean Association |
| NSA➣National Scrapbooking Association |
| NSA➣Naperville Soccer Association |
| NSA➣Nippon Software Industry Association (Japan) |
| NSA➣No Smoking Area |
| NSA➣Network Supported Account (Cisco) |
| NSA➣Never Standing Alone |
| NSA➣Nippon Steel Australia |
| NSA➣National Softball Association, Inc. |
| NSA➣Norcross Soccer Association (Georgia) |
| NSA➣Naval Supervising Activity |
| NSA➣National Singles Association (Atlanta, Georgia) |
| NSA➣Navy Stock Account |
| NSA➣Night Stalker Association |
| NSA➣National Success Association |
| NSA➣National Shuffleboard Association |
| NSA➣National Software Alliance |
| NSA➣No Significant Abnormalities (disease assessment) |
| NSA➣National Service Alliance, LLC |
| NSA➣Northern Slope of Alaska |
| NSA➣Non Semi Auto (concealed handgun license; Texas) |
| NSA➣Nantucket Shellfish Association (Nantucket, MA) |
| NSA➣Non Standard Area (of a database) |
| NSA➣National Standard Application |
| NSA➣National Scout Association |
| NSA➣Narrow-Slot Approximation |
| NSA➣National Sentinel Audit |
| NSA➣Node Switching Assembly |
| NSA➣Net Sales Area |
| NSA➣Network Search Algorithm |
| NSA➣Nikkei Student Association |
| NSA➣Nuclear Support Agency |
| NSA➣Naval Systems Analysis |
| NSA➣Net Sellable Area (real estate) |
| NSA➣National Sex Authority |
| NSA➣Network South Australia (Adelaide, Australia) |
| NSA➣Nichiren Shosu of America |
| NSA➣Neutron Source Assembly |
| NSA➣Nippon Supporters Association (Japan) |
| NSA➣Norwegian Security Act |
| NSA➣Net Server Assistant |
| NSA➣Nabelschnurarterie (German: Umbilical Cord Artery) |
| NSA➣Narrow Slot Aperture |
| NSA➣Nikkei Siam Aluminium Limited (Pathumtani, Thailand) |