NSM
- Computer Associates
- NASDAQ
- Nasjonal Sikkerhetsmyndighet
- National Science Museum of Japan
- National Socialist Movement (disambiguation)
- Natural semantic metalanguage
- Nausena Medal
- Naval Strike Missile
- Nederlandsche Scheepsbouw Maatschappij
- Nederlandsche Stoomboot Maatschappij
- Network File System
- Neurogenic stunned myocardium
- New Seasons Market
- New Sector Movements
- New Smoking Material
- New Socialist Movement
- New social movements
- Nipple delay
- Non-Stipendiary Minister
- Norseman Airport