| Name | Steam ID | Records | WRs |
|---|---|---|---|
| obelardos | 76561198033220421 | 1 | 0 |
| Obeliant | 76561198089449631 | 2 | 0 |
| Oberasu_Yamaki | 76561198379838224 | 1 | 0 |
| Obey Silent | 76561198978309813 | 11 | 0 |
| Obi | 76561198055965989 | 3 | 0 |
| Obi | 76561198350988320 | 4 | 0 |
| Obito | 76561198041825546 | 1 | 0 |
| Obivan Banan-_- | 76561198070173562 | 1 | 0 |
| Obliohs | 76561198200328590 | 1 | 0 |
| obliv | 76561198041141792 | 1 | 0 |
| Oblivion | 76561198184806593 | 1 | 0 |
| oblomoff | 76561197981949354 | 12 | 0 |
| ObnoxiousTraveler | 76561199184607968 | 4 | 0 |
| ObruS | 76561198119707400 | 9 | 0 |
| Obscura | 76561198056263722 | 19 | 0 |
| Obscure Username | 76561198075500861 | 82 | 0 |
| obseen1 | 76561198302289426 | 1 | 0 |
| OBSESSED WITH WEED | 76561198066120235 | 1 | 0 |
| Obsession | 76561198032830841 | 28 | 0 |
| Obsideo | 76561198194793797 | 15 | 0 |
| ObsidianSlam | 76561197990037782 | 4 | 0 |
| OBS NASDAQ | 76561198177740898 | 30 | 0 |
| Obunga Ubles | 76561198117028249 | 1 | 0 |
| Oby | 76561198149495594 | 18 | 0 |
| OBЛOB | 76561198012289984 | 18 | 0 |
| oCA MASTER #TF2Center @Bolo | 76561198127508395 | 1 | 0 |
| O.C.B. | 76561198331123668 | 49 | 0 |
| Occasional4yrold | 76561198063978916 | 1 | 0 |
| occasional_gamer | 76561198257372203 | 2 | 0 |
| Ocdleaks | 76561198140358214 | 1 | 0 |
| OceanicUK | 76561198126371897 | 8 | 0 |
| Ocean Man | 76561198022676644 | 3 | 0 |
| ocelot | 76561198088210841 | 2 | 0 |
| Ocelotl | 76561198022586266 | 3 | 0 |
| o Cet | 76561198159767289 | 1 | 0 |
| OchseUwenknecht.FJ | 76561198013208508 | 1 | 0 |
| Ockap | 76561198164184600 | 1 | 0 |
| Octo | 76561197966703837 | 1 | 0 |
| octopod | 76561197970525804 | 6 | 0 |
| ÖCÜ | 76561198080010931 | 1 | 0 |
| ocustomer | 76561198970036695 | 1 | 0 |
| Oczek08 | 76561198256712905 | 1 | 0 |
| Odd | 76561198353493924 | 3 | 0 |
| Ođđasat | 76561198283278959 | 5 | 0 |
| Oddity | 76561197979471088 | 1 | 0 |
| oddmoney | 76561198256831143 | 1 | 0 |
| ODIN | 76561197987539508 | 1 | 0 |
| Odinsdottir | 76561198328335648 | 1 | 0 |
| Odinsem | 76561198012644517 | 5 | 0 |
| Odin's Ravens | 76561198258715564 | 1 | 0 |