- A Kind of Magic MUSH [[MUSH] Pennmush 1.8.3 pl 13] (June 29, 2011)
- Kallisti MUD [[Dikumud] Diku/Original] (April 10, 2013)
- Keep Austin Wyrd [[MUX] ] (October 18, 2012)
- Kerovnia [[LP] LD-2.4.5-Kerov on LDMud 3.2.9] (April 11, 2006)
- Killer MUD [[Rom] 2.4 - hevy modified] (January 29, 2011)
- Kingdoms [[LP] LPC] (August 14, 2001)
- Kingdoms of the Lost [[Rom] 2.4 (Heavily Modified)] (September 17, 2004)
- Kingdoms3 [[Custom] Web/Turn Based Game] (March 10, 2000)
- KinslayerMUD [[Circlemud] heavily modified] (March 11, 2009)
- KitsuMUCK [[Unknown] ProtoMUCK] (August 8, 2012)
- Koitola [[Custom]] (February 7, 2008)
- Kushiel's Debut [[MUX] TinyMUX 2.3] (March 13, 2011)
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