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| name | tag | full name | site | registration | |
|---|---|---|---|---|---|
| OYA | *oYa* | Ownage Your Ass | 14 years | ||
 | OPPRESSION | opp. | Oppression | team-opp.com | 14 years |
| OTS | OtS|* | ONLY TEAM SURVIVOR | otsclanurt.es.tl | 14 years | |
| ONAIR | -On.aiR- | On.aiR | onair-clan.enjin.com | 14 years | |
 | ORDER66 | #O/66! | Order 66 | order66.net.tc | 14 years |
 | OSS | [OSS] | Occulti Super Sovrani | oss.netsons.org | 14 years |
| ONOFF | |O_o| | On_off | oo-team.eu | 14 years | |
| OC | 14 years | ||||
| OTTO | [OTTO] | Otto-Clan | clan.ottoscreen.de | 14 years | |
| ONEARM | [oneArm] | 14 years | |||
 | OUTLAW | ouTlaw][ | ouTlaw Promotion | outlaw-promotion.de | 14 years |
| OM3GA | {Om3ga} | Om3ga | 13 years | ||
| OGO | oG! | Online Gangsta Organization | ogo.urtclan.net | 13 years | |
 | OK | oK| | oKay Clan | okgam3r.com | 13 years |
| OXYGENE | .O2` | .Oxygène` | 13 years | ||
 | OWN | Online Warrior Nation | wix.com | 12 years | |
 | OPS | -|OPS|- | Ops Clan | mushcraft.enjin.com | 12 years |
| OMMU | |OMMU| | OMMU | 12 years | ||
| OPPOSITES | .:[O]:. | OPPOSITES | 12 years | ||
| OPX10 | Opal Core Op10 | 11 years | |||
| OASIS | .Oasis. | oasis-team | oasis-team.fr | 11 years | |
| OWP | owp. | Own peace | 11 years | ||
 | ONTOP | ontop. | ontop gaming | orks.fr | 11 years |
| OWLS | )O,O( | Owltribe | owltribe.iourt.com | 11 years | |
| ORIGIN | ORiGiNAL | 11 years |
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