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| name | tag | full name | site | registration | |
|---|---|---|---|---|---|
| UNK | unk| | Team Unknown | 10 years | ||
| UNABATED | team unabated | 9 years | |||
 | UNDYNE | Undyne!! | SpearofJustice | 8 years | |
| UNBALAN | No Longer Used | 14 years | |||
| UNDER1 | deleteMe | youtube.com | 9 years | ||
| USL | DEL | wait | 10 years | ||
| UMR | |UMR| | After Lab | 14 years | ||
| UTSP | - Urban Terror Superman Players- | wix.com | 13 years | ||
| UDA | 14 years | ||||
| UDR | 1 year | ||||
| UFA | [UFA]* | 13 years | |||
| UFP | 14 years | ||||
| UINVICTA | 8 years | ||||
| ULTRACLAN | 1 year | ||||
| ULTRAMANCLAN | 12 years | ||||
| ULTRAS | 11 years | ||||
| ULTRATEAM | 9 years | ||||
| UMD | 10 years | ||||
| UNA | 11 years | ||||
| UNC | 14 years | ||||
| UNITYHUB | 10 years | ||||
| UNKLAR | 9 years | ||||
| UNKNOWNTEAM | 8 years | ||||
| UNKTEAM | unK~ | 8 years | |||
| UNLIMITED | 14 years |
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