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| name | tag | full name | site | registration | |
|---|---|---|---|---|---|
| UA | {U/A} | Unforgiven Army | ua-hq.webs.com | 14 years | |
| UBERSKILLED | -uS# | uber Skilled | 10 years | ||
 | UBU | #UbU# | #UbU# team | ubu-team.org | 14 years |
 | UC | -UC- | Urban Criminals | urbancriminals.de | 14 years |
| UCRUSADERS | |UC| | Urban Crusaders | urbancrusaders.forumotion.com | 12 years | |
| UD | uD| | Urban Devils | urbandevilsclan.com | 10 years | |
 | UD1 | UD1. | Unité délite 1 | ud1.xooit.com | 10 years |
| UDT | [udt] | Urban Demolition Team | 11 years | ||
| UE | Urban Elite | 10 years | |||
| UEC | [UEC] | 10 years | |||
| UFM | {#UFM} | Urban Form -> dead | f2kpclan.tk | 13 years | |
 | UG | |UG| | urbangamers | urbangamers.dk | 14 years |
| UGC | [UGC] | UltimateGamers | ultimategamers.de | 12 years | |
| UGCLAN | uG. | Underground Gaming | 10 years | ||
| UI | [ui] | UI - Fun Team | 14 years | ||
| UK99 | >uK`99< | Unknown Killer | 9 years | ||
| UKN | .uKn. | Unknown | ukn-clan.tk | 13 years | |
| UKZ | |uKz| | UnrealKillerz | ukzclan.com | 13 years | |
| ULTEAM | [uL.] | Urban Legends | 10 years | ||
| ULTRA | ultra. | ultra | 9 years | ||
 | UM | .um | Urban Mulchers | urbanmulcher.webuda.com | 14 years |
| UM3 | [Um3] | Urban Mercenaries & Mango Mercha | um3.clanservers.com | 14 years | |
| UMP | ump- | Unrevealed Mysterious Phrase | ump-clan.com | 14 years | |
| UN | Un` | Urban Nannies | urbannannies.free.fr | 14 years | |
| UNBALANCED | </> | unbalanced | unbalanced-clan.com | 11 years |
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