- PKmud [[Merc] ] (September 10, 2012)
- PMC MOO [[MOO]] (September 30, 2003)
- Palavi [[Dawn]] (May 28, 2004)
- Pandora's Box: Reopened [[Oblivion] pbox 0.2] (March 2, 2013)
- Paradigm Shift [[ColdMud] Genesis 1.1.14-rc2] (February 22, 2013)
- Pegasus [[MUCK] TinyMUCK with minor customizations since the 90s] (July 19, 2011)
- Perilous Realms [[Custom] PR, in the spirit of SillyMud] (October 19, 2010)
- PernMUSH [TinyMUSH 2.2.4] (September 22, 1998)
- PernWorld [[MUSH]] (April 1, 2002)
- Persona MUSH [[MUSH]] (May 28, 2010)
- Petria [[Merc] medieval, español, castellano] (August 9, 2010)
- PhantasyWorld [[MOO] LambdaMOO, version 1.8.2u4g2 (VMOO compatible)] (January 30, 2006)
- Phidar [[Smaug] Heavily modified Smaug] (March 9, 2009)
- PhoenixMUD [[Circlemud] Circle 3.0, heavily modified] (February 2, 2009)
- Pict [[Rom] (Heavily Modified)] (December 21, 2012)
- PixieMUD [[LP] LDMud 3.3.720] (October 5, 2012)
- PlanesMUSH [[MUSH] ] (November 18, 2012)
- Planets: Rise to Power [[SWR] SWR 2.0 Massively Cleaned up] (November 7, 2012)
- Pokemon Frontier MUCK [[MUCK] Fuzzball] (March 9, 2011)
- Pokemon Fusion [[MUCK] Protomuck V2.0] (November 7, 2012)
- Pokemon Palladium (PX4) [[MUCK] ProtoMUCK 2.0] (September 3, 2009)
- Powermud [[LP] LPMUD 2.4.5 Heavily Modified] (June 29, 2005)
- Primal Darkness [[LP] Nightmare/Carnage] (December 9, 2009)
- Prime Directive [[MOO] LambdaMOO 1.8.1] (April 23, 2013)
- Primordiax [[Custom]] (June 15, 2010)
- Prodigy Academy [[MUCK]] (November 9, 2006)
- Project Bob [[Rom] More than heavily modified.] (January 18, 2009)
- Promage [[Custom] Visual Basic 6] (June 5, 2012)
- Prometheus: The Eternal Wars [[MOO] ] (April 21, 2013)
- Prophecies of the Pattern [[Rom] Heavy Modified] (October 29, 2012)
- Prophecy [[Rom] Modified ROM 2.4] (February 22, 2004)
- The PrideLand Chronicles [[MUCK] ] (March 19, 2013)
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