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| name | tag | full name | site | type | registration | |
|---|---|---|---|---|---|---|
| OVNI | Origines Veritables des Noobies | ovni.guild-heberg.fr | - | 13 years | ||
 | OR1G1N | [ORiGiN] | ORiGiNAL | clan | 11 years | |
| ORIGIN | ORiGiNAL | clan | 11 years | |||
| ORGANIC8 | Organic8 | - | 13 years | |||
 | ORDER66 | #O/66! | Order 66 | order66.net.tc | clan | 14 years |
 | OPS | -|OPS|- | Ops Clan | mushcraft.enjin.com | clan | 12 years |
| OPP | .opp. | Oppression | clan | 10 years | ||
 | OPPRESSION | opp. | Oppression | team-opp.com | clan | 14 years |
| OPPOSITES | .:[O]:. | OPPOSITES | clan | 12 years | ||
| OSW | OSW| | OpenSourceWarriors | - | 14 years | ||
| OPX10 | Opal Core Op10 | clan | 11 years | |||
| OOH | oOh! | server | 10 years | |||
| ONOFF | |O_o| | On_off | oo-team.eu | clan | 14 years | |
 | ONTOP | ontop. | ontop gaming | orks.fr | clan | 11 years |
| OTS | OtS|* | ONLY TEAM SURVIVOR | otsclanurt.es.tl | clan | 14 years | |
 | O1BR | o1` | ONLY Team | clan | 8 years | |
| OHS | Only Headshot | onlyheadshot.forumfree.it | - | 13 years | ||
 | OWN | Online Warrior Nation | wix.com | clan | 12 years | |
| OGO | oG! | Online Gangsta Organization | ogo.urtclan.net | clan | 13 years | |
| ONI | Oni- | Oni | clan | 7 years | ||
| ONEROAD | [O]R| | One*Road | clan | 10 years | ||
| OSA | oSa| | One Shot Army | osaurt.tk | - | 13 years | |
| OITC | One in the Chamber | - | 10 years | |||
| ONEHW | 1hW| | One Hit Wonders | onehitwonders.shivtr.com | clan | 10 years | |
| ODC | |ODC| | One Day Cup fr | onedaycup.fr | cup | 13 years |
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