| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | Ōkami | PS2 | 1.00 | Original |    | SLES-54439 … | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
 | Oh-chan no Oekaki Logic
おーちゃんのお絵かきロジック | SS | 1.005 | Original |  | T-1508G | |
 | One Piece Mansion | PSX | | Original | | SLUS-01406 | |
| Overkill & Lunar-C | CD32 | | Original | | /DP130002 | |
 | Oldtimer | ACD | | Original | | | |
| Option: Tuning Car Battle
オプション チューニングカーバトル | PSX | Rev 1 | PlayStation the Best | | SLPS 91037 |  |
| Official PlayStation 2 Magazine Demo 92 | PS2 | 1.00 | |   | SCED-54417 | |
| Overboard! | PSX | | Original, 1998 4 PlayStation Multi Pack | | SLES-00865 | |
| O.D.T. | PSX | | Original | | SLUS-00698 | |
| Over Drivin' IV
オーバードライビンⅣ | PSX | | Original | | SLPS 02099 | |
 | Oni
Они | PC | 1.0 | |  | | |
| Osada Avalona (Disc 1)
Осада Авалона | PC | | | | | |
| Osada Avalona (Disc 2)
Осада Авалона | PC | | | | | |
| Operation Flashpoint: Soprotivlenie
Operation Flashpoint: Сопротивление | PC | 1.85 | | | | |
| Operation Flashpoint: Holodnaja vojna
Операция Flashpoint: Холодная война | PC | 1.46 | Original | | | |
| Over Drivin' DX
オーバードライビンＤＸ | PSX | | Original | | SLPS 00327 | |
| Over Drivin' II
オーバードライビンⅡ | PSX | | Original | | SLPS 00895 | |
| Over Drivin' III: Hot Pursuit
オーバードライビンⅢ | PSX | | Original | | SLPS 01593 | |
| One | PSX | | Original | | SLUS-00469 | |
| Oddworld: Abe's Exoddus (Disc 2) | PSX | | Original | | SLUS-00731 … | |
| Oddworld: Abe's Exoddus (Disc 1) | PSX | | Original | | SLUS-00710 … | |
| Oddworld: Abe's Oddysee | PSX | | Original | | SLUS-00190 | |
| One Unit Whole Blood | PC | 1.21 | Original | | 04-16459CD1 | |
| Outlaws (Disc 1) | PC | 1.0 | Original | | 9511830 | |
| Outlaws (Disc 2) | PC | 1.0 | Original | | 9511831 | |
| Omega Boost | PSX | | Original | | SCUS-94449 | |
 | Official PlayStation 2 Magazine Demo 81 | PS2 | 1.00 | | | SCED-54406 … | |
| Oni | PS2 | 1.02 | Original, Platinum | | SLES-50134 … | |
| OverBlood
オーバーブラッド | PSX | | Original, PlayStation the Best | | SLPS 00392 … | |
| OverBlood | PSX | | Original | | SLES-00768 | |
| OPSM Best Racing Game Ever | PSX | | | | SCED-02492 | |
| Open Season | PSP | 1.01 | Original |  | ULES-00507 | |
| Online Start-Up Disc v3.0 | PS2 | 1.01 | | | SCUS 97425 | |
| Online Start-Up Disc 4.0 | PS2 | 1.00 | | | SCUS-97357 | |
| Onimusha: Warlords | PS2 | 1.02 | Original, Platinum | | SLES-50247 … | |
| Onimusha 2: Samurai's Destiny | PS2 | 1.03 | Original | | SLUS-20393 | |
| Oni | PS2 | 1.20 | Original | | SLUS-20064 | |
| One Piece Mansion | PSX | | Original | | SLES-03723 | |
| Olympic Soccer | PSX | | Original | | SLES-00113 | |
 | Official UK PlayStation Best Games Ever! | PSX | | | | SCED-03408 | |
| Official PlayStation Magazine Platinum Special Demo
Official UK PlayStation Magazine Platinum Special | PSX | | | | SCED-02122 | |
| Official PlayStation Magazine Best Games Ever 2000 | PSX | | | | SCED-03375 | |
| Official PlayStation 2 Magazine Demo 83 | PS2 | 1.00 | | | SCED-54408 … | |
| Official PlayStation 2 Magazine Demo 80 | PS2 | 1.00 | | | SCED-54405 | |
| Official PlayStation 2 Magazine Demo 79 | PS2 | 1.00 | | | SCED-54404 | |
| Official PlayStation 2 Magazine Demo 77 | PS2 | 1.01 | | | SCED-54049 | |
| Official PlayStation 2 Magazine Demo 76 | PS2 | 1.01 | | | SCED-54048 | |
| Official PlayStation 2 Magazine Demo 71 | PS2 | 1.02 | | | SCED-54043 | |
| Official PlayStation 2 Magazine Demo 69 | PS2 | 1.01 | | | SCED-53978 | |
| Official PlayStation 2 Magazine Demo 66 | PS2 | 1.00 | | | SCED-53169 | |
| Official PlayStation 2 Magazine Demo 65 | PS2 | 1.01 | | | SCED-53168 | |
| Official PlayStation 2 Magazine Demo 64 | PS2 | 1.00 | | | SCED-53167 | |
| Official PlayStation 2 Magazine Demo 62 | PS2 | 1.00 | | | SCED-53165 | |
| Official PlayStation 2 Magazine Demo 46 | PS2 | 1.01 | | | SCED-52161 … | |
| Official PlayStation 2 Magazine Demo 45 | PS2 | 1.02 | | | SCED-52160 | |
| Official PlayStation 2 Magazine Demo 44 | PS2 | 1.01 | | | SCED-52052 … | |
| Official PlayStation 2 Magazine Demo 32 | PS2 | 1.00 | | | SCED-51530 | |
| Official PlayStation 2 Magazine Demo 31 | PS2 | 1.02 | | | SCED-51529 | |
| Official PlayStation 2 Magazine Demo 22 | PS2 | 1.00 | | | SCED-50744 … | |
| Official PlayStation 2 Magazine Demo 16 | PS2 | 1.00 | | | SCED-50151 | |
| Odin Sphere | PS2 | 1.00 | Original, Greatest Hits | | SLUS 21577 … | |
| Oddworld: Abe's Oddysee | PSX | Rev 2 | Greatest Hits | | SLUS-00190 | |
 | Oddworld: Abe's Oddysee | PSX | | Original | | SLES-00841 | |
| Oddworld: Abe's Oddysee | PSX | | Demo | | SLED-00725 | |
| Oddworld: Abe's Oddysee | PSX | | Original, Platinum, Best of Infogrames: Value Series, Best of Infogrames: Adventure | | SLES-00664 … | |
| Oddworld: Abe's Exoddus (Disc 2) | PSX | | Original | | SLES-11505 | |
| Oddworld: Abe's Exoddus (Disc 1) | PSX | | Original | | SLES-01505 | |
| Oddworld: Abe's Exoddus (Disc 2) | PSX | | Original, Platinum | | SLES-11480 … | |
| Oddworld: Abe's Exoddus (Disc 1) | PSX | | Original, Platinum | | SLES-01480 … | |
