| Project XY | Developer | |
| Project99 | Developer | |
| ProjectLevel | Developer | |
| ProjectRed | Developer | |
| ProjectTrinity | Developer | |
| Projectile Entertainment | DeveloperPublisher | |
| Projector Studios | Developer | |
| Projekt_M | Developer | |
| Projeto Abyss | Developer | |
| Projetos Jogos Feevale | Developer | |
| Prokion | Developer | |
| Proletariat | DeveloperPublisher | |
| Prolific | Developer | |
| Prolific Publishing | DeveloperPublisher | |
| Proline Software | Developer | |
| Prologue Games | Developer | |
| Proma | Publisher | |
| Promat, Ltd | Publisher | |
| Promcast Limited | Developer | |
| Promethean Designs | Developer | |
| Promotion Software | Developer | |
| PronoesPro | Developer | |
| Pronto Games | Developer | |
| Propaganda Games | Developer | |
| Prope | Developer | |
| Proper Games | Developer | |
| Prophecia Studios | Developer | |
| ProsciuttoMan | Developer | |
| Prose | Developer | |
| Prosit | Developer | |
| Prosoft | Publisher | |
| Prosoft Corporation | Developer | |
| Prospect Games | Developer | |
| ProstoLyubo | Developer | |
| Prostone | Developer | |
| Proto Co. | Developer | |
| Proto1Studios | Developer | |
| Protohm Games | Developer | |
| Proton Fox | Developer | |
| Proton Squid | Developer | |
| Protoria Studios | Developer | |
| Protostar | Developer | |
| Prototype | DeveloperPublisher | |
| Protovision | Developer | |
| Proud Mom Games | Developer | |
| ProvidedPlay | Developer | |
| ProvidentialPotential | Developer | |
| Prox | Developer | |
| Prozrenue | Developer | |
| Prueba Sprites | Developer | |
| Prullansky | Developer | |
| Prune Games | Developer | |
| Prune Software | Developer | |
| Pryority Software | DeveloperPublisher | |
| Prystic | Developer | |
| Pryzmat | Developer | |
| Pseudavid | Developer | |
| Pseudo Interactive | Developer | |
| PseudoBytes | Developer | |
| PseudoDuo | Developer | |
| PseudoGamer01 | Developer | |
| Pseudome | Developer | |
| Pseudonym_Tim | Developer | |
| Pseudostew | Developer | |
| Pseudotom | Developer | |
| Psikyo | DeveloperPublisher | |
| PsikyoJP | Publisher | |
| Psilocybe Games | Developer | |
| Psion | Publisher | |
| Psion Software Ltd | Developer | |
| Psion Software Ltd (Steve Kelly) | Developer | |
| Psionic Games | Developer | |
| Psionic Systems | Developer | |
| Psiyko | Developer | |
| Psy-Sci (Tayo Olowu, Paul Voysey) | Developer | |
| PsyAc | Developer | |
| PsyRob | Developer | |
| PsycHead | Developer | |
| Psychefunk | Developer | |
| Psychic Software | DeveloperPublisher | |
| PsychicDamage | Developer | |
| Psycho | Developer | |
| Psycho-Soft | Developer | |
| PsychoFlux Entertainment | Developer | |
| PsychoHazard Software | DeveloperPublisher | |
| PsychoMoustache | Developer | |
| PsychoPatoune | Developer | |
| PsychoSeel | Developer | |
| PsychoWren | Developer | |
| Psychronic | Developer | |
| Psyclapse | Publisher | |
| Psyclone | Publisher | |
| Psycon Software | Publisher | |
| Psygnosis | DeveloperPublisher | |
| Psygnosis (EU) | Publisher | |
| PsygnosisEU | Publisher | |
| PsygnosisPAL | Publisher | |
| Psylodge | Developer | |
| Psyonix | DeveloperPublisher | |
| Psyonix Studios | Developer | |