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| Název | Systém | Žánr | Datum vydání | Score |
|---|---|---|---|---|
| One Piece: Burning Blood Spike Chunsoft · Released | PS4, PS Vita, Xbox One, PC | Fighting | 03 června 2016 | — |
| One Piece: Grand Cruise Spike Chunsoft · Released | PS4 | Adventure | 22 května 2018 | — |
| One Piece: Grand Gourmet Upcoming | — | — | 23 října 2026 | — |
| One Piece: Pirate Warriors Omega Force, Tecmo Koei · Released | PS3 | Action | 21 září 2012 | — |
| One Piece: Pirate Warriors 2 Omega Force, Tecmo Koei · Released | PS3 | Action | 30 srpna 2013 | — |
| One Piece: Pirate Warriors 3 Omega Force · Released | PS3, PC, PS4, PS Vita, Nintendo Switch | Action | 27 srpna 2015 | — |
| One Piece: Pirate Warriors 4 Omega Force · Released | PC, PS4, Xbox One, Nintendo Switch | Action | 27 března 2020 | — |
| One Piece: Romance Dawn Namco Bandai · Released | PSP, Nintendo 3DS | RPG | 29 listopadu 2013 | — |
| One Piece: Unlimited World Red Ganbarion · Released | PS3, PS4, PS Vita, Nintendo 3DS, Wii U, Nintendo Switch, PC | RPG | 27 června 2014 | — |
| One Piece: World Seeker Ganbarion · Released | PS4, Xbox One, PC | Action | 15 března 2019 | 7 |
| One Punch Man: A Hero Nobody Knows Spike Chunsoft · Released | PC, Xbox One, PS4 | Fighting | 28 února 2020 | — |
| One Single Life FreshTone Games · Released | iOS | Platform | 13 dubna 2011 | — |
| One Upon Light | PS4 | Puzzle | — | — |
| Onechanbara Z2: Chaos Tamsoft · Released | PS4 | Action | 2014 | — |
| Onee Chanbara Origin Tamsoft · Released | PS4, PC | Action | 14 října 2020 | — |
| OneShot: World Machine Edition Future Cat · Released | Nintendo Switch, PS4, Xbox One, PS5, Xbox Series X, PC | RPG, Adventure | 30 září 2022 | — |
| Onimusha 2: Samurai's Destiny Remaster Capcom · Released | Nintendo Switch, PS4, Xbox One, PC | Action | 23 května 2025 | 7 |
| Onimusha 3: Demon Siege Capcom | PS2 | Action | — | — |
| Onimusha: Warlords Capcom · Released | PC, PS4, Xbox One, Nintendo Switch | Action | 15 ledna 2019 | — |
| Onimusha: Way of the Sword Capcom · Released | PC, PS5, Xbox Series X, Nintendo Switch 2 | Action | 04 září 2026 | — |
| Oninaki Square Enix, Tokyo RPG Factory · Released | Nintendo Switch, PC, PS4 | RPG | 22 srpna 2019 | — |
| Onirike DevilishGames · Released | — | Platform, Puzzle | 2020 | — |
| Only Up! SCKR Games · Released | PC | Platform | 24 května 2023 | 7 |
| Onrush Codemasters · Released | PS4, Xbox One | Racing | 05 června 2018 | — |
| Ontos Frictional Games · Upcoming | PC, PS5, Xbox Series X | Horror | 2027 | — |
| Onward Downpour Interactive · Released | Meta Quest, Oculus Rift | Action | 29 srpna 2016 | — |
| Ooblets Glumberland · Released | PC, Xbox One | Simulation | 2020 | — |
| Open Country Fun Labs · Released | — | — | 03 června 2021 | — |
| Open Me! Japan Studio | PS Vita | Puzzle | TBA | — |
| Open Roads Fullbright · Released | PC, Xbox One, Xbox Series X, PS4, PS5, Nintendo Switch | Adventure | 28 března 2024 | — |
| Operation Abyss: New Tokyo Legacy Experience Inc. · Released | PS Vita | RPG | 05 června 2015 | — |
| Operation Darkness Success · Released | Xbox 360 | Strategy | 30 září 2008 | — |
| Operation Flashpoint: Dragon Rising Codemasters · Released | PC, PS3, Xbox 360 | Action | 09 října 2009 | — |
| Operation Flashpoint: Red River Codemasters · Released | PC, PS3, Xbox 360 | Action | 21 dubna 2011 | — |
| Operation Highjump: The Fall of Berlin Mansion Games · Released | PC, PS4, Xbox Series X, Nintendo Switch | Action, Platform | 31 března 2026 | — |
| Operation Night Strikers LTD, M2 Co · Released | Nintendo Switch | — | 07 srpna 2025 | 9 |
| Operation Serpens MeKiwi Oy, GINRA TECH · Released | PC, PS4, PS5 | — | 22 července 2020 | — |
| Operation: Tango Clever Plays · Released | PS4, PC, PS5 | Action, Puzzle | 01 června 2021 | — |
| Operencia: The Stolen Sun Zen Studios · Released | PC, Xbox One, PS4, Nintendo Switch | RPG | 29 března 2019 | — |
| Opoona Koei · Released | Wii | RPG | 12 září 2008 | — |
| Opus: Echo of Starsong Sigono Inc. · Released | PC, Nintendo Switch, Xbox One, Xbox Series X | Adventure | 27 července 2021 | — |
| Opus: Prism Peak Sigono Inc. · Released | Nintendo Switch, Nintendo Switch 2, PC | Adventure | 2025 | — |
| Orange Cast Valkyrie Initiative · Released | PC | — | 30 září 2020 | — |
| Orangeblood Grayfax Software | PC | RPG | TBA | — |
| Orbit 4Bit Games · Released | PC | Arcade | 30 června 2015 | — |
| Orbital Bullet SmokeStab | PC | Action, Platform | TBA | — |
| Orbital Gear Night Node Software | Linux, Mac, PC | Action | — | — |
| Orbital Overdrive Released | PC | — | 31 března 2026 | — |
| Orbitals Shapefarm · Released | Nintendo Switch 2 | Adventure | 03 září 2026 | — |
| Orcs Must Die Robot Entertainment · Released | Xbox 360, PC, XBLA | Action, Strategy | 05 října 2011 | — |