| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | O-to-i-re: Dreamcast Sequencer
お・と・い・れ ドリームキャストシーケンサー | DC | 1.002 | Original |   | T-32801M |  |
| O.G.A Onigokko Royal: Hunter wa Field de Koi o Suru
Ｏ＊Ｇ＊Ａ 鬼ごっこロワイアル ハンターは孤島（フィールド）で恋をする | PSP | 1.01 | Genteiban | | ULJM 06298 | |
| Oak Mook 13: Ultrabook 3: Ura Game Dokuhon Furoku CD-ROM
ＯＡＫ ＭＯＯＫ１３ ウルトラブック３ 裏ゲーム読本 付録ＣＤ－ＲＯＭ | PC | | Original | | | |
 | Ob"ekt 69: Kasablanka
Объект 69: Касабланка | PC | | Original |  | RUSSOBIT-M 2003/408 | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
| Ob"ekt 69: Mest' Krassera
Объект 69: Месть Крассера | PC | | Original | | | |
| Obaachan no Chiebukuro
おばあちゃんの知恵袋 | FMT | | Original | | HMC-169 | |
| Obbligato (Taikenban CD-ROM)
オブリガート 体験版CD-ROM | PC | | Demo | | | |
| Obitaemyj ostrov
Обитаемый остров | PC | | Original | | | |
| Obitaemyj ostrov: Chuzhoj sredi chuzhix
Обитаемый остров: Чужой среди чужих | PC | | Original | | | |
| Obitaemyj ostrov: Zemlyanin
Обитаемый остров: Землянин | PC | | Original | | | |
| Obitel' T'my
Обитель Тьмы | PC | 5.02 04/07/03 | Original | | | |
| Obitel' t'my: Sumerki
Обитель тьмы: Сумерки | PC | 1.1 | Original | | | |
| Oblachno, vozmozhny osadki v vide frikadelek
Облачно, возможны осадки в виде фрикаделек | PSP | 1.00 | Original | | ULES-01361 | |
 | Oblivious Garden: Carmina Burana (Disc 1) (Game Disk) | PC | 1.0 | Standard Edition |  | | |
| Oblivious Garden: Carmina Burana (Disc 2) (Music Disc) | PC | | Standard Edition | | | |
| Oboro Muramasa
朧村正 | WII | | Original, Minna no Osusume Selection | | RVL-RSFJ-JPN-B0 | |
 | Obscure
ObsCure | XBOX | | Original | | MI-009 | |
| Obscure
ObsCure | XBOX | | Original |   | MI-009 | |
| Obscure
ObsCure | XBOX | | Original |   | MI-009 | |
 | Obscure
ObsCure | XBOX | | Original | | MI-009 | |
| Obscure: The Aftermath
ObsCure: The Aftermath | PSP | 1.01 | Original | | ULES-01340 | |
| Obscure: The Aftermath
ObsCure: The Aftermath | WII | | Beta | | | |
| Obscure: The Aftermath
ObsCure: The Aftermath | PC | | Original | | | |
| Obscure: The Aftermath
ObsCure: The Aftermath | WII | | Original | | RVL-ROBE-USA | |
| Obscure: The Aftermath
ObsCure: The Aftermath | PSP | 1.00 | Original, Test Sample | | ULUS-10484 | |
| Obscure: The Aftermath
ObsCure: The Aftermath | PS2 | 1.00 | Original | | SLUS-21709 | |
| Obsidian (Disc 1) | MAC | | Original, Great Series | | INR-001, MKM-001 | |
| Obsidian (Disc 2) | MAC | | Original, Great Series | | INR-001, MKM-001 | |
| Obsidian (Disc 3) | MAC | | Original, Great Series | | INR-001, MKM-001 | |
| Obsidian (Disc 4) | MAC | | Original, Great Series | | INR-001, MKM-001 | |
| Obsidian (Disc 5) | MAC | | Original, Great Series | | INR-001, MKM-001 | |
| Ocean Commander | PS2 | 1.01 | Original | | SLES-55047 | |
| Ocean Commander | WII | | Original | | RVL-RQME-USA | |
| Ocean/Infogrames Show Case December 1997 | PC | | | | | |
| Oceans Below
オーシャンズ・ビロウ | MAC | | Original | | MSC001 | |
| Oceans Below
The Software Toolworks Presents ... Oceans Below | MAC | | Original | | 2198620-590001 / I 073100, CDRM1103420 | |
| Ocha no Ma Battle
お茶の間バトル | PSX | | Bundled with Controller | | SLPM 86681 | |
| Ochazukenori: Kaiki!! Mushi Danshaku no Yakata
御茶漬海苔 怪奇！！蟲男爵の館 | PC | | Original | | | |
| Octomania | WII | | Original | | RVL-RTKE-USA | |
| Oda Nobunaga Den
織田信長伝 | PSX | | Original, Koei the Best | | SLPM 86337 … | |
| Odama | GC | | Original | | DL-DOL-GOOP-EUR | |
| Odama
大玉 | GC | Rev 1 | Bundled with Microphone | | DL-DOL-GOOJ-JPN | |
| Odama | GC | Rev 1 | Original | | DL-DOL-GOOE-USA | |
| Oddballz: Your Wacky Computer Petz | PC | 1.0 | Original | | CS090370 | |
| Oddworld: Abe's Exoddus (Play Disc) | PC | 2.0 | Budget, Covermount | | MMICDR 5280 | |
 | Oddworld: Abe's Exoddus (Installatie Disk) | PC | 2.0 | Budget | | MMICDR 5280 | |
| Oddworld: Abe's Exoddus + Duke Nukem: Time to Kill + B-Movie | PSX | | Demo | | SLED-01608 | |
 | Oddworld: Abe's Exoddus + Duke Nukem: Time to Kill + Duke Nukem: 3D | PSX | | | | SLED-01655 | |
| Oddworld: Abe's Exoddus: US Manual | MAC | | Art Assets | | | |
| Oddworld: Munch's Oddysee | XBOX | | Original | | MS-001 | |
| Oddworld: Munch's Oddysee | XBOX | | Original | | MS-001 | |
 | Oddworld: Munch's Oddysee | XBOX | | Original, Classics | | MS-001 | |
 | Oddworld: Munch's Oddysee | XBOX | | Original | | MS-001 | |
 | Oddworld: Munch's Oddysee | XBOX | | Original | | MS-001 | |
| Oddworld: Munch's Oddysee | XBOX | | Original, Platinum Hits | | MS-001 | |
| Odin Sphere
オーディン・スフィア | PS2 | 1.02 | Original, PlayStation 2 the Best | | SLPM 66474 … | |
| Odin Sphere: Leifthrasir
オーディンスフィア レイヴスラシル | PS3 | 01.00 | Original | | BLJM 61239 | |
 | Odium
ōdi·um | PC | | Covermount | | | |
| Odium
ōdi·um | PC | | Original | | CD-W58-1104-0 | |
| ODN Palm Power Pack | PALM | | Original | | | |
| Odo Odo Oddity
おどおど おっでぃ | PSX | | Hibaihin | | SLPM 80075 | |
| Odoru Made in Wario
おどる メイド イン ワリオ | WII | | Original | | RVL-RODJ-JPN | |
| ODS Amazing Art Corner | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Carnival Math | PC | 5.0r134 | Teacher's Edition | | | |
| ODS Carnival Math | PC | 5.0r134 | Teacher's Edition | | | |
| Odyssey: The Legend of Nemesis | MAC | 1.0 | Original | | | |
 | Oesterreichische Nationalbibliothek: Multimediale Enzyklopaedie auf 3 CD-i's (Disc 1) (Prunksaal/Impressionen) | CDI | | Original | | 0103313 | |
| Oesterreichische Nationalbibliothek: Multimediale Enzyklopaedie auf 3 CD-i's (Disc 2) (Sammlungen) | CDI | | Original | | 0103313 | |
| Oesterreichische Nationalbibliothek: Multimediale Enzyklopaedie auf 3 CD-i's (Disc 3) (Apokalypse) | CDI | | Original | | 0103313 | |
| Of Light and Darkness: The Prophecy (Disc 1) | PC | | Dice | | DMM 030689 | |
| Of Light and Darkness: The Prophecy: Premonitions Disk | PC | | | | CD-C95-166-DM | |
 | Of Orcs and Men | PC | | Original | | | |
| Of Orcs and Men | XBOX360 | | Original | | FE-2009 | |
| Of Orcs and Men | PS3 | 01.01 | Original | | BLES-01586 | |
| Off Limits: Cassiopeia | PC | | ROMWARE | | ROM 10100 | |
| Off Limits: Mizar | PC | | ROMWARE | | ROM 10120 | |
| Off-World Interceptor Extreme | PSX | | Original | | SLES-00047 | |
| Off-World Interceptor Extreme | SS | 1.000 | Original | | T-15908H-50 | |
| Off-World Interceptor Extreme
オフワールド・インターセプター エクストリーム | PSX | | Original | | SLPS 00122 | |
| Off-World Interceptor Extreme
オフワールド・インターセプター エクストリーム | SS | 1.000 | Ketteiban | | T-15901G | |
| Off-World Interceptor Extreme | PSX | | Original | | SLUS-00020 | |
| Off-World Interceptor Extreme | SS | 1.000 | Original | | T-15908H | |
| Offensive
Offensive War: The Ultimate Strategical Combat Game | PC | | Covermount | | | |
| OfficeGames | PC | | Original | | | |
| The Official Browser of Primagames.com | PC | | | | | |
| Official Demo Disc 1: Retail Edition November 01 | PS2 | 1.04 | Kiosk Demo | | SCED-50615 | |
| Official Demo Disc Retail Edition February 02
official demo disc retail edition february 02 | PS2 | 1.02 | | | SCED-50732 | |
| Official Duke Nukem 3D Level Design Handbook | PC | | Original | | 1869-0 | |
| Official Fan Book: Circadia: Special CD-ROM
オフィシャルファンブック サーカディア | PSX | | Original | | SCZS 94106 | |
| Official Formula 1 Racing | PC | | Original | | | |
| The Official Guide to Babylon 5
The Official Guide to J. Michael Straczynski's Babylon 5 | PC | | Original | | | |
 | The Official Guide to The Daedalus Encounter: Companion Disc | PC | | Original | | | |
| Official Lara Croft: Real Life '99 Lara: Character Images | PC | | Press Kit | | | |
| Official PlayStation 2 Magazine 02/2004: Uncut Edition
Das Offizielle PlayStation 2 Magazin 02/2004: Uncut Edition | PS2 | 1.01 | | | SCED-52082 | |
| Official PlayStation 2 Magazine 09/2004
Das Offizielle PlayStation 2 Magazin 09/2004 | PS2 | 1.02 | | | SCED-52089 … | |
| Official PlayStation 2 Magazine 13/2003: Uncut Edition
Das Offizielle PlayStation 2 Magazin 13/2003: Uncut Edition | PS2 | 1.00 | | | SCED-51937 | |
 | Official PlayStation 2 Magazine Demo 1 | PS2 | 1.00 | | | SCED-50065 | |
| Official PlayStation 2 Magazine Demo 10 | PS2 | 1.10 | | | SCED-50145 | |
| Official PlayStation 2 Magazine Demo 10
ops2m demo 10 | PS2 | 1.00 | | | SCED-50404 | |
| Official PlayStation 2 Magazine Demo 10 | PS2 | 1.00 | | | SCED-50406 | |
