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| Game | Platform | Developer | Publisher (JP) | Publisher (NA) | Publisher (PAL) |
|---|---|---|---|---|---|
| Ōkamiden | Nintendo DS | Mobile & Game Studio | Capcom | Capcom | Capcom |
| Old Skies | Linux, Microsoft Windows, Nintendo Switch, macOS | Wadjet Eye Games | N/A | Wadjet Eye Games | Wadjet Eye Games |
| Olympia Soirée | Nintendo Switch | Idea Factory, Otomate | Idea Factory | Aksys Games | Aksys Games |
| Omega 6: The Triangle Stars | Microsoft Windows, Nintendo Switch | City Connection | Clear River Games | Clear River Games | Clear River Games |
| Omega Quintet | Microsoft Windows, Sony PlayStation 4 | Galapagos RPG | Compile Heart | Idea Factory | Idea Factory |
| Omensight | Microsoft Windows, Nintendo Switch, Sony PlayStation 4 | Spearhead Games | N/A | Spearhead Games | Spearhead Games |
| Omoide ni kawaru kimi ~Memories Off~ | Microsoft Windows, Sega Dreamcast, Sony PSP, Sony PlayStation 2, iOS | KID | 5pb., CyberFront Corporation, KID | N/A | N/A |
| Omori | Microsoft Windows, Microsoft Xbox One, Microsoft Xbox Series X|S, Nintendo Switch, Sony PlayStation 4, macOS | OMOCAT | OMOCAT | OMOCAT | OMOCAT |
| Once Again | Microsoft Windows, macOS | RB Wolf Design | RB Wolf Games | RB Wolf Games | RB Wolf Games |
| One Fourth RPG [Cancelled] | Sony PlayStation 2 | FromSoftware | N/A | N/A | N/A |
| One Last Dungeon | Microsoft Windows, macOS | Thawmus | N/A | Thawmus | Thawmus |
| One Lonely Outpost | Microsoft Windows | Aurorian Studios, indie.io | N/A | indie.io | indie.io |
| One Piece Odyssey | Microsoft Windows, Microsoft Xbox Series X|S, Nintendo Switch, Sony PlayStation 4, Sony PlayStation 5 | ILCA | Bandai Namco Entertainment | Bandai Namco Entertainment | Bandai Namco Entertainment |
| One Piece: Romance Dawn | Nintendo 3DS, Sony PSP | Three Rings | Bandai Namco Entertainment | Bandai Namco Entertainment | Bandai Namco Entertainment |
| One Way Heroics | Microsoft Windows | Smoking WOLF | N/A | PLAYISM | PLAYISM |
| Onimusha Tactics | Nintendo Game Boy Advance | Capcom | Capcom | Capcom | Capcom |
| Oninaki | Microsoft Windows, Nintendo Switch, Sony PlayStation 4 | Tokyo RPG Factory | Square Enix | Square Enix | Square Enix |
| Ooblets | Microsoft Windows, Microsoft Xbox One, Nintendo Switch | Glumberland | Glumberland | Glumberland | Glumberland |
| Open Roads | Microsoft Windows, Microsoft Xbox Series X|S, Sony PlayStation 4, Sony PlayStation 5 | Fullbright | Annapurna Interactive | Annapurna Interactive | Annapurna Interactive |
| Operation Abyss: New Tokyo Legacy | Microsoft Windows, Sony PS Vita | Experience | 5pb., Mages | NIS America | NIS America |
| Operation Babel: New Tokyo Legacy | Microsoft Windows, Sony PS Vita | Experience | 5pb., Mages | NIS America | NIS America |
| Operation Darkness | Microsoft Xbox 360 | Success | Success | Atlus | N/A |
| Operencia: The Stolen Sun | Microsoft Windows, Microsoft Xbox One, Nintendo Switch, Sony PlayStation 4 | Zen Studios | N/A | Zen Studios | Zen Studios |
| opoona | Nintendo Wii | ArtePiazza | Koei Tecmo Games | Koei Tecmo Games | Koei Tecmo Games |
| OPUS: Echo of Starsong | Microsoft Windows, Nintendo Switch, Sony PlayStation 5, macOS | SIGONO | SIGONO | SIGONO | SIGONO |
