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| Top Mud Sites - MUD Listing | Quick MUD Search |
| MUD Name | MUD Address | Codebase | Location | Homepage | Current Rank |
| Unwritten Legends | www.unwritten.net:6666 | Custom | USA |  |
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| Unicorn Valley | unicornvalley.org:2500 / 204.209.44.124:2500 | Smaug | Canada | |
135 |
| Ugas Daos | www.ugasdaos.com:23 | Custom | USA | |
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| Ultimate Realms | ultimate-realms.org:2222 | Lp MUD | Germany | |
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| Ulyenthia | ulyenthia.com:4000 | ROM | USA | |
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| Underworld MUSH | underworld.teamlimit.net:9812 | PennMUSH | USA | |
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| Unholy Lands | klein.htu.tuwien.ac.at:2010 | Lp MUD | Austria | - | |
| United Dreams III | mud.united-dreams.com:2000 | Lp MUD | Netherlands | |
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| UNItopia | unitopia.de:23 | Lp MUD | Germany | |
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| Unknown Regions | halk.dhs.org:5555 | Star Wars Reality | USA | |
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| UnnamedMud | unnamedmud.org:2468 | CirceMUD | USA | |
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| Unofficial Ultima MUD | forge.silverden.com:9240 | Smaug | USA | |
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| Untamed Lands | untamedlands.betterbox.net:4321 | Smaug | USA | |
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| Urath | 198.144.66.104:4000 | Custom | USA | |
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| UrMud | urmud.com:80 | Custom | USA | |
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| Ursha Null 7 | gs.ursha7.com:7777 | Custom | USA | |
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| Utopia | chrasilis.wolfpaw.net:8400 | Godwars | USA | |
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