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| name | tag | full name | site | type | registration | |
|---|---|---|---|---|---|---|
| OR | - | 13 years | ||||
| OPX10 | Opal Core Op10 | clan | 11 years | |||
 | OPS | -|OPS|- | Ops Clan | mushcraft.enjin.com | clan | 12 years |
 | OPPRESSION | opp. | Oppression | team-opp.com | clan | 14 years |
| OPPOSITES | .:[O]:. | OPPOSITES | clan | 12 years | ||
| OPP | .opp. | Oppression | clan | 10 years | ||
| OPALXSQUAD | - | 11 years | ||||
| OOH | oOh! | server | 10 years | |||
| OO | O.O| | O.O | - | 14 years | ||
| ONTOPGAMING | - | 11 years | ||||
| ONTOPGAMIING | - | 11 years | ||||
 | ONTOP | ontop. | ontop gaming | orks.fr | clan | 11 years |
| ONOFF | |O_o| | On_off | oo-team.eu | clan | 14 years | |
 | ONLYWIN | - | 13 years | |||
 | ONIICHAN | Kawaii. | お兄ちゃん | clan | 3 years | |
| ONICHAN | kkkkk. | asdasd | - | 3 years | ||
| ONI | Oni- | Oni | clan | 7 years | ||
| ONFIRE | oF` | oF | clan | 10 years | ||
| ONEUT | |oNe| Owning Noobs Everywhere | one-urt.com | - | 13 years | ||
 | ONEURT | |oNe| | Owning Noobs Everywhere ( oNe ) | one-urt.com | - | 13 years |
| ONESTEPAHEAD | - | 12 years | ||||
| ONESTEP | - | 12 years | ||||
| ONESHOT | - | 6 years | ||||
| ONESHOOT | - | 6 years | ||||
| ONEROAD | [O]R| | One*Road | clan | 10 years |
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