NSF
- N-ethylmaleimide sensitive fusion protein
- NASASpaceFlight.com
- NES Sound Format
- NOF (radio station)
- NS-Frauenschaft
- NSF International
- Naga Students' Federation
- National Salvation Front (disambiguation)
- National Science Foundation
- National Secessionist Forces
- National Service Framework
- National Sleep Foundation
- National Socialist Front
- National Students Federation
- National service in Singapore
- Nephrogenic systemic fibrosis
- New Small Family
- Non-sufficient funds
- Norges Speiderforbund
- Norsk Syndikalistisk Forbund
- North Sea Fleet
- Notes Storage Facility
- Nykterhetsrörelsens Scoutförbund
- Palestinian National Security Forces
- Thiazyl fluoride