| Username | Team | |
|---|---|---|
| OrbDC | Orbital Disconnection [br] | View Profile |
| OrbDC_Butchanator | Orbital Disconnection [br] | View Profile |
| Ordinal | Miscelators [rl] | View Profile |
| Ordorika | Raining Hostias [br] | View Profile |
| Orecus | Hockey Is Our MasCot [xrl] | View Profile |
| oRefleX | IBuyFlipside [rl] | View Profile |
| Oregone | No Team | View Profile |
| Oreoshi | The Power of Three [rl] | View Profile |
| OreoTitan | Proximity [rl], Legacy [rl], Galaxy [rl], No Boost No Dream [rl], , The Better Fouxtrell [rl], We Are Nutty [rl], Slip N Slide [rl] | View Profile |
| oResponse | Shore [rl] | View Profile |
| Orgalorg | Team FeelsBadMan [rl] | View Profile |
| Organisation Aimless | No Team | View Profile |
| OriginalStable | MK Marions [rl] | View Profile |
| OriGiNBreAch | N.O.M [rl] | View Profile |
| Origin_K | Hurricane Loomin [rl], Ding Dong Demo [rl], RRelentless [rl], Husky = Best Mod [rl], Washed Up [rl], Frigus [rl], FrigBois [rl], Destiny 2 for PC waiting room. [rl], sp00ky b0is [rl], Peasant Festival [rl], Ding Dong Demo [rl], Relentless [rl] | View Profile |
