| | Name | Platforms | Developer | Publisher | |
|---|
| Office Simulator | Steam | | | |
| Office Simulator #J-147-N | ItchIo | Julian Spinelli | | |
| Office Space | ItchIo | LastResortGames | | |
| Office Space: Idle Profits | Steam | | | |
| Office lovers | Steam | | | |
| Office | RAGE! | ItchIo | FrankyKey | | |
| OfficeBots: Reality Bytes [VR] | Steam | | | |
| OfficeHours | ItchIo | Sound | | |
| OfficeRL | ItchIo | DrMelon | | |
| Officer Chair | ItchIo | NITZ! | | |
| Official Drill Training Place | Roblox | | | |
| Official Father Christmas Game, The | ZXSpectrum | Enigma Variations (Shaun McClure) | Alternative Software | |
| Official Father Christmas, The | AmstradCPC | | Alternative Software | |
| Official Wicked Vixen Silicone Scramble | Steam | | | |
| Official Wicked Vixen Whack-A-Dick Pro | Steam | | | |
| Offline Dinosaur Hunt | ItchIo | Thane5 | | |
| Offroad Driving Simulator 4x4 | Steam | | | |
| Offroad Driving Simulator4x4: Trucks & SUV Trophy | 3DS | Game Mavericks | Game Mavericks | |
| Offroad Extreme! | PS2 | Phoenix Games | Phoenix Games | |
| Offroad Extreme! Special Edition | Wii | Data Design Interactive | Conspiracy EntertainmentData Design InteractivePAL | |
| Offroad Game Engine | ItchIo | yodacz | | |
| Offroad Horizons: Arcade Rock Crawling | Steam | | | |
| Offroad Mania | Steam | | | |
| Offroad Racing - Buggy X ATV X Moto | Steam | | | |
| Offroad Racing On Line | Steam | | | |
| Offroad Racing: Buggy X ATV X Moto | XboxOne | Artefact Studio | Microids | |
| Offroad Thunder | Arcade | | Midway | |
| Offroad Transport Simulator | Steam | | | |
| Offroading (BETA) | Roblox | | | |
| Offshore Tycoon | Wii | | Valcon Games | |
| Offside Legends | Switch | Team Serpico | Team Serpico | |
| Offspring Fling! | Steam | | | |
| Offworld | ItchIo | Tengu Games | | |
| Offworld Defender | ItchIo | Balin P | | |
| Offworld Trading Company | Steam | | | |
| Ogami Ichiro Funtouki: Sakura Taisen Kayou Show - Benitokage Yori | Dreamcast | Sega | Sega | |
| Ogre | AppleIIDOSPC88PC98Steam | Steve MeuseOrigin SystemsORIGIN Systems | Origin SystemsSystemSoft | |
| Ogre Battle 64: Person of Lordly Caliber | N64 | Quest Corporation | Atlus USANANintendoJP | |
| Ogre Battle: The March of the Black Queen | PS1 | Quest | Atlus | |
| Ogre Battle: The March of the Black Queen - •Densetsu no Ogre BattleJP | SNES | Quest | Enix | |
| Ogre Duel Multiplayer | ItchIo | David López | | |
| Ogre Land | ItchIo | Bl4ckRose | | |
| Ogre Push! | ItchIo | Giorgio Malvone | | |
| Ogre Tale | SteamSwitch | Mages | Degica Games | |
| Ogrez | Steam | | | |
| Oh Boy Cheese | Steam | | | |
| Oh Crab! | ItchIoSteam | Sokpop Collective | | |
| Oh Frog | Steam | | | |
| Oh God Why | ItchIo | figgyfunk | | |
| Oh God, What Happened At Persephone-23? | ItchIo | Umbra | | |
| Oh HI Doggy ! | ItchIo | OlivierSchyns | | |
| Oh Honey | ItchIo | TJ Lagasse | | |
| Oh I'm Getting Taller! | ItchIo | Elf Games | | |
| Oh Jeez, Oh No, My Rabbits Are Gone! | Steam | | | |
| Oh Jeez, Oh No, My Rabbits Are Gone!!! | ItchIo | Studio Nevermore | | |
| Oh Mai Tiara : The Road For Love | ItchIo | Gogen-Soft | | |
| Oh Mayan God (patched) | ItchIo | SpicyFrog | | |
| Oh Mummy | AmstradCPCZXSpectrum | Darren WhiteJohn Line | AmsoftGem Software | |
| Oh My Cooking Gun | Steam | | | |
| Oh My Corn...! | ItchIo | Daniel Moreno | | |
| Oh My Girl / 我的女孩 | Steam | | | |
| Oh My Git! | ItchIo | blinry | | |
| Oh My God! | Arcade | | Atlus | |
| Oh My Godheads | SteamXboxOne | Titutitech | Square Enix Collective | |
| Oh My Gore! | Steam | | | |
| Oh My Heart | ItchIo | David Night | | |
| Oh My Yuri! | ItchIo | ibrahimhosceylan | | |
| Oh No! | PS1 | Asmik Ace | Asmik Ace | |
| Oh No! - A Game of Chance | Windows | Stephen R. Woods | Financial Systems Associates, Inc. | |
| Oh No! Bugs! | ItchIoSteam | Doomgriever | | |
| Oh No! More Lemmings | DOSWindows | DMA Design | Psygnosis | |
| Oh No! Ninjas! | Steam | | | |
| Oh No! Not Another J-RPG! | ItchIo | bhimz | | |
| Oh No! Not Another RPG! - Extended Edition | ItchIo | bhimz | | |
| Oh No! The Factory is going Crazy!! | ItchIo | SIGI | | |
| Oh No! There's A Dinosaur In Your Bathroom! | ItchIo | Crash Triassic | | |
| Oh No! You have a horrible job! | ItchIo | darkpony | | |
| Oh No!! Where's the tool? | ItchIo | Sieber2210 | | |
| Oh No, A UFO!!! - Adventure Box | ItchIo | AdventureBox | | |
| Oh No, The Hero Glitched to the End! | ItchIo | Soulwithlife | | |
| Oh No, Trolls! | ItchIo | Vitridax | | |
| Oh No... i need create something!!! | ItchIo | Jean_ClG | | |
| Oh Ship Arena | Steam | | | |
| Oh Snake! | ItchIo | anomalina | | |
| Oh So Lucky, Doctor! | Steam | | | |
| Oh Trap! | Steam | | | |
| Oh Well | ItchIo | Rodrigo Vieira | | |
| Oh my blood! | ItchIo | Hechi | | |
| Oh my life | ItchIo | Karen | | |
| Oh no | ItchIo | enui | | |
| Oh no! Faded colors | ItchIo | ImDaBanana | | |
| Oh no! Gojira! | ItchIo | jeeyoh | | |
| Oh no! The Endless Ladder! | ItchIo | Yenoxx | | |
| Oh no! You are on the sun orbit! | ItchIo | Yenoxx | | |
| Oh no! You got lost in the forest! | ItchIo | Yenoxx | | |
| Oh no! You have lost your pants! | ItchIo | Yenoxx | | |
| Oh no, I have to finish my essay! | ItchIo | Zushi3DHero | | |
| Oh no, my manga! | ItchIo | Ophaneom | | |
| Oh no. I feel off the cliff | ItchIo | MiniTardigrade | | |
| Oh shit... run for it! | ItchIo | LeoninoMalino | | |
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