UU
- 2U (disambiguation)
- Air Austral
- The Mind Robber
- U'u
- U2 (disambiguation)
- UUNET
- Ulster University
- Ulster University F.C.
- Undead Unluck
- Union University
- Union of Utrecht (Old Catholic)
- Unique user
- Unitarian Universalism
- United Utilities
- Universal Mobile Telecommunications System
- University of Utah
- Unseen University
- Uppsala University
- Utica University
- Utrecht University
- Uttaranchal University
- VV (disambiguation)
- W (disambiguation)