| Region | Title | System | Version | Edition | Languages | Serial | Status |
|---|
 | O.D.T. | PSX | | Original |  | SLES-01412 |  |
| Oddworld: Abe's Exoddus (Disc 1) | PSX | | Original | | SLES-01505 | |
| Oddworld: Abe's Exoddus (Disc 2) | PSX | | Original | | SLES-11505 | |
| Oddworld: Abe's Oddysee | PSX | | Original | | SLES-00841 | ![2 and more dumps from original media [!]](/images/status/green.png "2 and more dumps from original media [!]") |
| Oddworld: Munch's Oddysee | XBOX | | Original | | MS-001 | |
| Official PlayStation 2 Magazine Demo 10 | PS2 | | | | SCED-50406 | |
| One Must Fall 2097 | PC | | Original |   | | |
| One Must Fall 2097
One Must Fall | PC | | Rerelease | | D.L.: M-8684-97 | |
| Oro y Gloria: La Ruta hacia El Dorado | PSX | | Original | | SLES-03187 | |
| Official PlayStation 2 Magazine Demo 15 | PS2 | 1.00 | |   | SCED-50708 | |
| Official PlayStation 2 Magazine Demo 26 | PS2 | 1.00 | | | SCED-51321 | |
| Official PlayStation 2 Magazine Demo 30 | PS2 | 1.00 | | | SCED-51552 | |
| Official PlayStation 2 Magazine Demo 32 | PS2 | 1.00 | | | SCED-51656 | |
| Official PlayStation 2 Magazine Demo 41 | PS2 | 1.00 | | | SCED-52158 | |
| Official PlayStation 2 Magazine Demo 54 | PS2 | 1.00 | | | SCED-53067 | |
| Official PlayStation 2 Magazine Demo 34 | PS2 | 1.01 | | | SCED-51760 | |
| Official PlayStation 2 Magazine Demo 40 | PS2 | 1.01 | | | SCED-52054 | |
| Official PlayStation 2 Magazine Demo 42 | PS2 | 1.02 | | | SCED-52270 | |
| Oni | PS2 | 1.02 | Original | | SLES-50179 | |
| Official PlayStation 2 Magazine Demo 23 | PS2 | 1.10 | | | SCED-51163 | |
