| 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 | |