| | Name | Platforms | Developer | Publisher | |
|---|
| Oh! | ItchIo | Louis Rigaud | | |
| Oh! Kitsune-sama | PC98 | Curott | Curott | |
| Oh! My Roommate Is A Lasergun?! | ItchIo | Hempuli | | |
| Oh! Pai | FMTownsPC98X68000 | Silky's | Silky's | |
| Oh! RATS! | ItchIo | Vimlark | | |
| Oh! You Monster! | ItchIo | point bleep | | |
| Oh, Beehive! | ItchIo | Kat Pokesie | | |
| Oh, I'm a Cat Now I guess | ItchIo | Max Oakland | | |
| Oh, It's Christmas | ItchIo | Naughty Shinobi | | |
| Oh, Reader | ItchIo | spines | | |
| Oh, Terry! | ItchIo | Vimi | | |
| Oh, Thanks! | ItchIo | MaxMcCart | | |
| Oh, To Be(e) In Love | ItchIo | communistsister | | |
| Oh, ship! | ItchIo | TheaDesigns | | |
| Oh, you touch my balls ( ͡° ͜ʖ ͡°) | Steam | | | |
| Oh...Sir! Prototype | Steam | | | |
| Oh...Sir! The Hollywood Roast | ItchIoSteamSwitchWindows | Artur ekhart DębkowskiVile Monarch | Gambitious | |
| Oh...Sir! The Insult Simulator | SwitchWindows | Vile Monarch | Gambitious | |
| Oh...Sir!! The Insult Simulator | SteamXboxOne | Vile Monarch | Vile Monarch | |
| OhShape | Steam | | | |
| Oha Star 645: Musshees no Fushigi na Nouen - Yoshimoto Geinin to Tomodachi Net | DS | Culture Brain | Culture Brain | |
| Oha Star Dance Dance Revolution | PS1 | Konami | Konami | |
| Ohanaya-san Monogatari | GBA | | TDK Core | |
| Ohasuta Dance Dance Revolution GB | GBC | Now Production | Konami | |
| Ohasuta Yama-chan & Raymond | GBC | Epoch | Epoch | |
| Ohayou! Beginner's Japanese | SteamWiiU | Finger Gun Games | Finger Gun Games | |
| Ohenro-San | Gamecube | Panasonic Corporation | Panasonic Corporation | |
| Ohmygod Are You Alright? | ItchIo | anna anthropy | | |
| Ohr: אור | Steam | | | |
| Ohyl Libbe | ItchIo | jakalofnight | | |
| Oi, Innkeep! | Steam | | | |
| Oi, Innkeep! Chronicles! - EP. 1 - Fire and Marshmallows | Steam | | | |
| Oib.io | ItchIo | LapaMauve | | |
| Oide Rascal | GBC | Agatsuma Entertainment | Tamsoft | |
| Oik | Steam | | | |
| Oik 2 | Steam | | | |
| Oik 3 | Steam | | | |
| Oik 3D | Steam | | | |
| Oik 4 | Steam | | | |
| Oik 5 | Steam | | | |
| Oik Memory | Steam | | | |
| Oik Memory 2 | Steam | | | |
| Oik Memory 3 | Steam | | | |
| Oik Memory: Endgame | Steam | | | |
| Oik Reloaded | Steam | | | |
| Oika | Steam | | | |
| Oikospiel Book I | ItchIo | DK | | |
| Oil Baron | Steam | | | |
| Oil Barons | AppleIIDOS | Epyx | Epyx | |
| Oil Enterprise | Steam | | | |
| Oil Panic | ItchIo | Crazy Piri | | |
| Oil Patrol | ItchIo | Sean Noonan | | |
| Oil Rush | Steam | | | |
| Oil Tycoon | DOS | Jeffrey T. KorringaMicheal A. Swenson | Rocky Mountain Software | |
| Oil Wars | Steam | | | |
| Oil jump | ItchIo | Gfrid | | |
| Oil's Well | DOS | Sierra On-Line | Sierra On-Line | |
| Oilcap | DOS | Soleau Software | Soleau Software | |
| Oiligarch | ItchIo | dxk2294 | | |
| Oilo Oilo | ItchIo | Carlos Fdez Llamas | | |
| Oilwell | DOS | MTK Software | MTK Software | |
| Oily | ItchIo | Andy Bae | | |
| Oinari Origami | ItchIo | GadgetPatch | | |
| Oink Royale | ItchIo | Skoggy Games | | |
| Oishii Puzzle Wa Irimasen Ka | Arcade | | Sunsoft | |
| Oja Majo Do-Re-Mi #: Mahodou Dance Carnival! | PS1 | Bandai | Bandai | |
| Oja Majo Doremi | PS1 | Bandai | Bandai | |
| Oja Majo Doremi Dokkan! Nijiiro Paradise | PS1 | Bandai | Bandai | |
| Ojamajo Doremi # | SegaPico | Fupac | Bandai | |
| Ojamajo Doremi Dokka~n! | SegaPico | Fupac | Bandai | |
| Ojarumaru | SegaPico | Bandai | Bandai | |
| Ojarumaru: Gekkou Machi Sanpo de Ojaru | GBA | | MTO | |
| Ojarumaru: Mitsunegai Jinja no Ennichi de Ojaru! | GBC | | MTO | |
| Ojarumaru: Tsukiyo ga Ike no Takaramono | GBC | | Success | |
| Ojousama Kumikyoku: Sweet Concert | PS2 | Pionesoft | Pionesoft | |
| Ojousama Tokkyuu | SegaSaturn | MediaWorks | MediaWorks | |
| Ojousama wo Nerae!! | SegaSaturn | Crystal Vision | Crystal Vision | |
| Ojyousama Express | PS1 | MediaWorks | MediaWorks | |
| Ojōsama Sōsamō | PCFX | Fill-in-CafeHeadroom | NEC Home Electronics | |
| Okabu | PS3 | HandCircus | | |
| Okada Toshi no Tsume Shougi Kyoushitsu Nintei-Ou | PS1 | ASCII Entertainment | ASCII Entertainment | |
| Okaeri | ItchIoSteam | Chilla's Art | | |
| Okaeri! Chibi-Robo! Happy Richie Oosouji! | DS | Skip Ltd. | Nintendo | |
| Okage: Shadow King - •Boku to MaouJP | PS2 | Zener WorksSony Computer Entertainment | Sony Computer Entertainment | |
| Okaitoku Series 5: Puzzle & Tantei Collection (Puzzle & Tantei Collection) | GBA | | Culture Brain | |
| Okami HD | Steam | | | |
| Okami: Zekkeiban HD Remaster | PS3 | Capcom | | |
| Okamoto Ayako to Match Play Golf | SNES | C.P. Brain | Tsukuda Original | |
| Okappari-Oh | PS1 | Spiel | Naxat Soft | |
| Okay, Panic! | Steam | | | |
| Okay. | ItchIo | Xascoria | | |
| Okey Hile Ustası | ItchIo | ali_ayan | | |
| Okhlos: Omega | Steam | | | |
| Okiraku Beach Volley 3D | 3DS | Arc System Works | Arc System Works | |
| Okiraku Daifugō 3D | 3DS | Arc System Works | Arc System Works | |
| Okiraku Golf 3D | 3DS | Arc System Works | Arc System Works | |
| Oknytt | Steam | | | |
| Oko Furia | ItchIo | Tselmek | | |
| Okosband | ItchIo | OveAhlman | | |
| Okudera Yasuhiko no Sekai wo Mezase! Soccer Kids: Nyuumon Hen | SegaSaturn | Japan Media Programming | Fujitsu Parex | |
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