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| Game | Platform | Developer | Publisher (JP) | Publisher (NA) | Publisher (PAL) |
|---|---|---|---|---|---|
| Odin Sphere: Leifthrasir | Sony PS Vita, Sony PlayStation 3, Sony PlayStation 4 | Vanillaware | Atlus | Atlus | NIS America |
| Of Ash and Steel | Microsoft Windows | Fire & Frost | tinyBuild | tinyBuild | tinyBuild |
| Of Orcs and Men | Microsoft Windows, Microsoft Xbox 360, Sony PlayStation 3 | Cyanide Studio, Spiders | N/A | Focus Entertainment | Focus Entertainment |
| OFF (Remaster) | Microsoft Windows, Nintendo Switch | Fangamer, Mortis Ghost | N/A | Fangamer | Fangamer |
| Ogre Battle 64: Person of Lordly Caliber | Nintendo 64, Nintendo Wii, Nintendo Wii U | Quest | Nintendo | Atlus | Atlus |
| Ogre Battle: The March of the Black Queen | Nintendo Wii, Sega Saturn, Sony PlayStation, Super Nintendo Entertainment System | Quest | Quest | Square Enix | N/A |
| Okage: Shadow King | Sony PlayStation 2, Sony PlayStation 4 | Sony Interactive Entertainment, Zener Works | Sony Interactive Entertainment | Sony Interactive Entertainment | Sony Interactive Entertainment |
| Ōkami | Nintendo Wii, Sony PlayStation 2 | Clover Studio | Capcom | Capcom | Capcom |
| Ōkami (Sequel) | Clovers | Capcom | Capcom | Capcom | |
| Ōkami HD | Microsoft Windows, Microsoft Xbox One, Nintendo Switch, Sony PlayStation 3, Sony PlayStation 4 | Clover Studio, HexaDrive | Capcom | Capcom | Capcom |
| 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 |
