| Name | Steam ID | Records | WRs |
|---|---|---|---|
| ULTRAS STILON | 76561198041939840 | 1 | 0 |
| ultraviolence(dead ins) | 76561198150986967 | 1 | 0 |
| UltraWave | 76561197970882027 | 2 | 0 |
| Ulvase | 76561198138340682 | 2 | 0 |
| umaibo | 76561197990221138 | 1 | 0 |
| Umbre-off | 76561198343544583 | 1 | 0 |
| umcarara | 76561198047250787 | 70 | 0 |
| UMD | 76561198002382618 | 2 | 0 |
| ummmm | 76561197974492748 | 1 | 0 |
| umop 3p!sdn | 76561198033299184 | 1 | 0 |
| 【UMP9】🐾 | 76561198030870937 | 1 | 0 |
| =UMPA=Vapor | 76561197971999692 | 1 | 0 |
| 【Umpy】📼 | 76561197992432404 | 79 | 0 |
| uN | 76561198993494531 | 1 | 0 |
| uN1ok3r | 76561198024312724 | 2 | 0 |
| -un1q3ul | 76561198084301863 | 1 | 0 |
| un3k | 76561198197195550 | 2 | 0 |
| UnAimeD | 76561198017884339 | 3 | 0 |
| UnaimedPlaya | 76561198149163178 | 6 | 0 |
| Unarmed Draxman | 76561198014326169 | 1 | 0 |
| unazoomer | 76561198104264219 | 1 | 0 |
| uNb1nd | 76561198110790388 | 1 | 0 |
| (un)BannedFromCanadaV2 | 76561198799590517 | 10 | 0 |
| unbind | 76561198053238899 | 1 | 0 |
| Unbound | 76561198192390301 | 2 | 0 |
| uNby | 76561198116125082 | 1 | 0 |
| uncleanpurity | 76561198258634095 | 1 | 0 |
| Uncle Ben | 76561198069466980 | 1 | 0 |
| Uncle Ben (The Rice Guy) | 76561198254332402 | 1 | 0 |
| Uncle Bobbo | 76561198052102834 | 2 | 0 |
| UncleDanny | 76561198087794423 | 1 | 0 |
| Uncle Fass | 76561198011910122 | 1 | 0 |
| Uncle Joey | 76561198041462704 | 2 | 0 |
| Uncle Muscles (Dotarding) | 76561197994130088 | 1 | 0 |
| Uncle Ramon | 76561198011020808 | 2 | 0 |
| UncleRazor | 76561197989933111 | 1 | 0 |
| UncleSam | 76561198351485831 | 1 | 0 |
| UncleStalin | 76561198257335629 | 3 | 0 |
| uncreative | 76561197987738204 | 8 | 0 |
| uNd3r7aKeR | 76561198410556330 | 1 | 0 |
| Undead | 76561198127183665 | 1 | 0 |
| UndeadAgr | 76561198065844301 | 4 | 0 |
| uN*DeaD|eXten | 76561198113076079 | 2 | 0 |
| Undecide | 76561198091100883 | 5 | 0 |
| undefined.OwL | 76561198129981779 | 1 | 0 |
| Under | 76561198328502655 | 1 | 0 |
| underdog | 76561198043880899 | 1 | 0 |
| Underdog | 76561198153445374 | 4 | 0 |
| Under_Dog | 76561198254883338 | 1 | 0 |
| Underestimated Power | 76561198262742446 | 72 | 0 |