Other
- Studite Brethren (Monaci Studiti Ucraini), a religious society of the Ukrainian Greek Catholic Church
- McMaster Students Union, in Hamilton, Ontario, Canada
- Military Specialized Unit, unit of the Kosovo Force (KFOR)
- Movement for Socialism and Unity, a Senegalese political party
- Muslim Students Union (variation of Muslim Students' Association)
Read more about this topic: MSU