MNS
- MNS antigen system
- Maharashtra Navnirman Sena
- Maki-Nakagawa-Sakata matrix
- Malaysian Nature Society
- Manganese(II) sulfide
- Mansi language
- Ministry of National Security (disambiguation)
- Minneapolis, Northfield and Southern Railway
- Mirror neuron
- Mission Need Statement
- Monday Night Soccer
- Movement for a New Society
- National Syndicalists (Portugal)