| Name | Steam ID | Records | WRs |
|---|---|---|---|
| OBSESSED WITH WEED | 76561198066120235 | 1 | 0 |
| Obsession | 76561198032830841 | 28 | 0 |
| Obsideo | 76561198194793797 | 15 | 0 |
| obsidian | 76561199557932513 | 1 | 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 |
| od.JOhn | 76561198193199266 | 1 | 0 |
| Odler | 76561197993287253 | 7 | 0 |
| odo proudfoot | 76561197980018942 | 41 | 0 |
| Odoroki Kijun | 76561198016172300 | 4 | 0 |
| Oduckie | 76561199199666715 | 2 | 0 |
| Odyn | 76561198053009115 | 2 | 0 |
| odysseus_psn | 76561198258263732 | 1 | 0 |
| odyvan | 76561198090058821 | 23 | 0 |
| Oeb | 76561198041921068 | 241 | 0 |
| Oelcorv | 76561198313462667 | 14 | 0 |
| oEnot | 76561198100811260 | 1 | 0 |
| Ofc Emmett | 76561198167925700 | 0 | 0 |
| ofc esports | 76561198825721253 | 1 | 0 |
| ofdensen | 76561198272898496 | 1 | 0 |
| Ofelia | 76561198273108270 | 1 | 0 |
| ofey | 76561197963071977 | 2 | 0 |