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| Mutator | Author | Info | |
|---|---|---|---|
| :: oWo.tallyho! : 1.0.4a :: | Unknown | 1 mutator | |
| Objective Alert Delayer! | Unknown | 1 mutator | |
| Old Skool | Necron_99 | 1 mutator | |
| OldGlory | Unknown | 1 mutator | |
| OldMutator | Unknown | 1 mutator | |
| OldSkool | usaar33 | 1 mutator | |
| OneShotEnforcer | Bashar | 1 mutator | |
| OP's Fast Weapon Switcher | Unknown | 1 mutator | |
| Otium | Unknown | 1 mutator | |
| Overkilled Version1 | Unknown | 3 mutators | |
| Ownage | Unknown | 1 mutator |