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| name | tag | full name | site | type | registration | |
|---|---|---|---|---|---|---|
| UNDERAGE | .uA- | Under Age | - | 13 years | ||
| UGCLAN | uG. | Underground Gaming | clan | 10 years | ||
| UND | ]_[ | Underscore | - | 14 years | ||
| UNEQUAL | unQ. | uneQual. | clan | 9 years | ||
| UA | {U/A} | Unforgiven Army | ua-hq.webs.com | clan | 14 years | |
| UNHIT | Unhit.UrT clan | fun | 4 years | |||
| UNION | -UoR- | Union of Revolution | uor.xooit.fr | - | 13 years | |
| UNIURT | UniUrT| | Union UrT | uniurt.com | server | 10 years | |
| UNIQUE | |UiQ{ | UniQue Clan | - | 12 years | ||
 | UNIQUECLAN | uniQue. | UniQue Crew | unique-crew.de | clan | 10 years |
| UNIQ | uniQ. | UniQue e-sports | clan | 10 years | ||
 | UD1 | UD1. | Unité délite 1 | ud1.xooit.com | clan | 10 years |
| UNITED5 | UNITED| | United 5 | urban-zone.org | - | 9 years | |
| UNITEDADMINS | United Admins (Team Infinity) | - | 9 years | |||
 | UAE | United Arab Emirates | - | 11 years | ||
| UNITEDS | UNITED5| | United Five | clan | 9 years | ||
| UFS | UFS| | United Force Special | fun | 11 years | ||
| UNITED | `uP | United Pangaea | - | 12 years | ||
| UPF | ={UPF}= | United Pro Fraggers | - | 13 years | ||
| UNITEDSNIPRS | #uS`` | United Snipers | forum.us-clan.xoo.it | clan | 8 years | |
| USMAFIA | US.Mafia | United States Mafia | - | 13 years | ||
| UNITEDTEAMS | UT* | United Teams | unitedteams.ovh | clan | 7 years | |
| UTF | ]UTF[ | United Tux for Freedom | - | 13 years | ||
| UWR | United Warriors | - | 13 years | |||
| UNITE | unite. | United we stand, divided we fall | clan | 10 years |
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