| Paladin | 2002 | — | — |
| Palladium Fantasy Role-Playing Game | 1983 | Palladium Books | United States |
| Pamphlet II: Dystopia | — | — | — |
| Pandemonium | 1993 | — | — |
| Panels | 2001 | self-published work | — |
| Pantheon and Other Roleplaying Games | 2000 | Hogshead Publishing | United Kingdom |
| Panty Explosion | 2006 | — | — |
| Paranoia | 1984 | — | United States |
| Paranoia "Fifth" Edition | 1995 | West End Games | — |
| Paranoia (1st edition) | 1984 | West End Games | — |
| Paranoia (2nd edition) | 1987 | West End Games | — |
| Paranoia 25th Anniversary edition | 2009 | Mongoose Publishing | — |
| Paranoia RED Clearance edition | 2017 | Mongoose Publishing | — |
| Paranoia XP | 2004 | Mongoose Publishing | — |
| Part-Time Gods | 2011 | — | — |
| Pathfinder Adventure Path #123: The Flooded Cathedral | — | — | — |
| Pathfinder Roleplaying Game | 2009 | Paizo Publishing | United States |
| Pathfinder Roleplaying Game (1st edition) | 2009 | Paizo Publishing | United States |
| Pathfinder Roleplaying Game (2nd edition) | 2019 | Paizo Publishing | United States |
| Patient 13 | 2007 | Éditions John Doe / Chibi | France |
| Pavillon Noir | 2000 | Black Book Éditions | France |
| Pax Draconis | 2001 | — | — |
| Pendragon | 1985 | Chaosium | United States |
| Perils & Princesses | 2024 | — | — |
| Phantasia | 1988 | — | — |
| Phantasy Conclave | 1984 | — | — |
| Phase VII | 1982 | — | — |
| Phase World | 1994 | Palladium Books | United States |
| Phoenix Command | 1986 | — | — |
| Pirates and Plunder | 1982 | Yaquinto Publications | United States |
| Pirates! | 2003 | — | — |
| Player's Handbook | June 1978 | TSR | United States |
| Player's Option: Skills & Powers | 1995 | TSR | United States |
| Players Handbook (1st ed.) | June 1978 | TSR | United States |
| Poison'd | 2007 | Lumpley Games | United States |
| Pokémon Jr. Adventure Game | 1999 | Wizards of the Coast | United States |
| Pokéthulhu | 2000 | Cumberland Games & Diversions | United States |
| Polaris | 2009 | TAO Games | United States |
| Polaris | 1997 | — | France |
| Portes, Monstres & Trésors | 2012 | — | — |
| Post mortem | 2003 | Oriflam | France |
| Powered by the Apocalypse | 2010 | — | United States |
| Powers and Perils | 1983 | Avalon Hill | United States |
| Praedor | 2000 | Burger Games | Finland |
| Premières légendes : Légendes de la Table Ronde | 1986 | Jeux Descartes | France |
| Pretender | 2003 | self-published work | — |
| Prime Directive | 1993 | — | — |
| Primetime Adventures | 2004 | — | — |
| Prince Valiant: The Story-Telling Game | 1989 | Chaosium | United States |
| Privateers and Gentlemen | 1982 | Fantasy Games Unlimited | United States |
| Professional Wrestling | 1977 | — | — |
| Project A-ko: The Roleplaying Game | 1995 | — | — |
| Promethean: The Created | 2006 | White Wolf Publishing | United States |
| Prophecy | 2000 | Halloween Concept | France |
| Prose Descriptive Qualities (PDQ) system | 2004 | Atomic Sock Monkey Press | United States |
| Prosopopée | 2012 | self-publishing | France |
| Providence | 1997 | — | — |
| Psi World | 1984 | Fantasy Games Unlimited | United States |
| Psi*Run | 2007 | — | United States |
| Pulp Hero | 2005 | — | — |
| Pumpkin Town | 1999 | self-published work | — |
| Puppetland | 1997 | Hogshead Publishing | United Kingdom |
| Příběhy Impéria | 2009 | — | Czech Republic |