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| Top Mud Sites - MUD Listing | Quick MUD Search |
| MUD Name | MUD Address | Codebase | Location | Homepage | Current Rank |
| OGC: Legends of Terris | - | Custom | United Kingdom |  |
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| Obirod 2 | slayn.net:6666 | Lp MUD | USA | |
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| Oblivion: Destiny's End | oblivionmud.org:3003 | DikuMUD | USA | |
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| OceanCrest | falconcrest.yi.org:4040 | Mordor | USA | |
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| One Percent | 1mud.org:9000 | ROM | USA | - | |
| Online Gaming Resource | ogrmush.com:6700 | TinyMUSH | USA | |
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| Online Roleplay Resource Center | http://www.onlineroleplay.com:0 | Custom | USA | |
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| Onslaught:EoC | bb1.betterbox.net:5500 | CircleMUD | USA | |
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| OracleBBS | oraclebbs.com:23 | Unique | USA | - | |
| Organelle | organelle.org:4045 | Custom | USA | |
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| Otherworld the land of Tirn Aill | tirnaill.com:4000 | CircleMUD | USA | |
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| Ouroboros MUD | ouroboros.mudplace.org:8000 | ROM | USA | |
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| OurPlace Mud | ourplace.org:6543 | Envy | USA | |
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| Out of Darkness | 12.171.188.40:4040 | Godwars | USA | |
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| Out of Time | - | MUX | Sweden | - | |
| Outer Realms | cyrus.mudhaven.com:4321 | Unique | USA | - | |
| Outlands | theoutlands.net:4444 | ROM | Not Listed Here | |
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| Outlands - 4th Age | void.dune.net:3000 | ROM | USA | |
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| OutlandsMud | outlandsmud.com:4000 | DikuMUD | USA | |
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| Outpost Station | the-edge.dynip.com:6666 | PennMUSH | USA | - | |
| Outreach | 209.123.65.13:6969 | TinyMUSH | USA | |
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| Outremer | outremermux.org:4321 | MUX | USA | |
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| Overdrive | overdrive.overdrivemud.net:5195 | Lp MUD | USA | |
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| Overkill | 217.10.143.11:4321 | Godwars | United Kingdom | - | |
| Overkill | mudcraft.net:9999 | Godwars | United Kingdom | - | |
| Overlord | overlord.dungeon.ws:2000 | Lp MUD | United Kingdom | |
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