| Acronym | Definition |
|---|
| UU➣Uppsala Universitet (University of Uppsala, Sweden) |
| UU➣University of Ulster |
| UU➣Unitarian Universalist |
| UU➣University of Utah |
| UU➣Undang-Undang (Malaysian tax) |
| UU➣University of Utrecht (Netherlands) |
| UU➣Unique User (Web metrics) |
| UU➣United Utilities (UK) |
| UU➣Uniqlo Undercover (clothing) |
| UU➣Unix-To-Unix |
| UU➣User-to-User |
| UU➣Unter Umstaenden (German: Circumstances Permitting) |
| UU➣Unix User |
| UU➣Urbana University (Urbana, Ohio) |
| UU➣Ureteroureterostomy (urology) |
| UU➣Under Used (gaming) |
| UU➣Unless Used |
| UU➣Ultima Underworld |
| UU➣Unconsolidated Undrained |
| UU➣Until Uru (game) |
| UU➣Utsunomiya University (Japan) |
| UU➣Ultimate User |
| UU➣User Unit |
| UU➣Ultimate Use |
| UU➣University of Uludag (Bursa, Turkey) |
| UU➣Usmania University (India) |