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| Název | Systém | Žánr | Datum vydání | Score |
|---|---|---|---|---|
| Of Bird and Cage Capricia Productions · Released | PC | Action, Music, Adventure | 20 května 2021 | — |
| Of Kings and Men Donkey Crew | PC | Action | TBA | — |
| Of Orcs and Men Cyanide Studios, Spiders Studio · Released | PC, PS3, Xbox 360 | Action, RPG | 12 října 2012 | — |
| Off The Grid Gunzilla Games · Released | PC, PS5, Xbox Series X | — | 2023 | — |
| Off-Road Drive 1C: Avalon · Released | PC | Racing | 12 ledna 2012 | — |
| Offworld Trading Company Mohawk Games · Released | PC | Strategy | 28 dubna 2016 | — |
| Oh My Godheads Titutitech · Released | Xbox One, PS4, PC | Party | 05 prosince 2017 | — |
| Oh...Sir! The Insult Simulator Vile Monarch · Released | PC, Mac, Linux, Android, iOS | Simulation | 25 října 2016 | — |
| OK K.O.! Let's Play Heroes Capybara Games · Released | PC, PS4, Xbox One | Action, RPG, Fighting | 31 března 2018 | — |
| Okabu Hand Circus · Released | PS3, PSN | Puzzle | 19 října 2011 | — |
| Okami Clover Studios · Released | PS2, Wii, PS3 | Action, Adventure | 2007 | — |
| Okami HD Clover Studios · Released | PS3, PS4, Xbox One, PC, Nintendo Switch | Action, Adventure | 31 října 2012 | — |
| Okami Sequel Clovers | — | Adventure | TBA | — |
| Okamiden Capcom · Released | Nintendo DS | Adventure | 18 března 2011 | — |
| Okhlos Coffee Powered Machine · Released | PC, Mac, Linux | Action, Strategy | 18 srpna 2016 | — |
| Old Man's Journey Broken Rules | PC, iOS, Android, Nintendo Switch | Puzzle, Adventure | — | — |
| Old School Rally Frozen Lake Games · Released | PC | Racing | 19 července 2024 | — |
| Old School Runescape Jagex | Mac, PC, iOS, Android | MMORPG | — | — |
| Old Time Hockey V7 Entertainment · Released | PC, PS4, Xbox One | Sports | 31 března 2017 | — |
| Old World Mohawk Games · Released | PC | Strategy | 30 září 2020 | — |
| Olija Skeleton Crew Studio · Released | PC, Nintendo Switch, Xbox One, PS4 | Action, Adventure | 28 ledna 2021 | — |
| Oliver & Spike: Dimension Jumpers Rock Pocket Games | — | Platform, Adventure | TBA | — |
| OlliOlli Roll7 · Released | PS Vita, PC, PS3, PS4, Wii U, Nintendo 3DS, Xbox One | Platform, Sports | 22 ledna 2014 | — |
| OlliOlli 2: Welcome to Olliwood Roll7 · Released | PS4, PS Vita, PC, Mac, Linux, Xbox One | Sports | 04 března 2015 | — |
| OlliOlli World Roll7 · Released | PC, Xbox One, Xbox Series X, PS4, PS5, Nintendo Switch | Platform | 08 února 2022 | — |
| OlliOlli: Switch Stance Roll7 · Released | Nintendo Switch | Platform, Sports | 14 února 2019 | — |
| Olympic Games Tokyo 2020: The Official Video Game Sega | PS4, Nintendo Switch, Xbox One, PC | Sports | — | — |
| OmegaBot Released | PC, PS4, PS5, Nintendo Switch, Xbox One, Xbox Series X | Action, Platform | 16 června 2022 | — |
| Omelet You Cook SchuBox Games · Released | PC | Action | 07 června 2025 | — |
| Omen of Sorrow AOne Games · Released | PS4, PC, Xbox One | Fighting | 08 června 2019 | — |
| Omensight Spearhead Games · Released | PC, PS4 | Action | 15 května 2018 | — |
| Omerta: City of Gangsters Haemimont Games · Released | PC, Xbox 360, Mac | Strategy | 01 února 2013 | — |
| Omnibus Buddy Cops · Released | PC, Mac, Linux | Action, Simulation, Adventure | 31 května 2016 | — |
| Omno Studio Inkyfox, Jonas Manke · Released | PC, Xbox One, PS4, Nintendo Switch | Puzzle, Adventure | 29 července 2021 | — |
| Omori OMOCAT · Released | PC, Nintendo Switch, PS4, Xbox One, Xbox Series X | RPG, Horror | 25 prosince 2020 | — |
| OMSI 2 MR Software | PC | Simulation | — | — |
| On the Rocks LootBag Studios · Upcoming | PC | Simulation | 2026 | — |
| On Your Tail Memorable Games · Released | Nintendo Switch | Adventure | 31 října 2024 | — |
| On-Together GigaPuff | PC | Adventure | — | — |
| Once Human Starry Studio · Released | PC, iOS, Android, Xbox Series X, PS5 | — | 10 července 2024 | — |
| Once Upon a Katamari Bandai Namco · Released | Nintendo Switch, Xbox Series X, PS5, PC | Puzzle | 24 října 2025 | — |
| Once Upon A Puppet Flatter Than Earth · Released | PC, Xbox Series X, PS5, Nintendo Switch | Platform, Adventure | 23 dubna 2025 | 6 |
| Onde Lance, 3-50 · Released | iOS, Nintendo Switch, PC | Puzzle, Adventure | 17 března 2022 | — |
| One Btn Bosses Midnight Munchies | PC | — | TBA | 8 |
| One Last Breath Moonatic Studios · Released | PC, PS4 | Platform, Adventure | 2022 | — |
| One Lonely Outpost Indie.io · Released | PC, PS4, PS5, Nintendo Switch, Xbox One, Xbox Series X | Strategy | 26 června 2023 | 6 |
| One Military Camp Abylight Barcelona · Released | PC, PS5, Xbox Series X, Nintendo Switch 2 | Simulation | 20 července 2023 | 8 |
| One Piece Bon! Bon! Journey!! Released | iOS, Android | Puzzle | 2020 | — |
| One Piece Odyssey ILCA · Released | PC, PS4, PS5, Xbox Series X | RPG | 13 ledna 2023 | 6 |
| One Piece: Bounty Rush Bandai Namco · Released | Android, iOS | Action | 2019 | — |