| Title | Platform | Genre | Score | Release Date |
|---|---|---|---|---|
| Obelix | 2600 | Action | 1986 | |
| Off the Wall | 2600 | Action | 1989 | |
| Once Upon a Knight | PC | Real-Time Strategy | 5.9 | Sep 25, 2003 |
| One-on-One Basketball | 7800 | Basketball Sim | 1987 | |
| Operation Blockade | PC | Rail Shooting | 3.6 | May 13, 2002 |
| Operation Steel Tide | PC | Submarine Sim | Dec 25, 2002 | |
| Operation Thunderstorm | PC | Historic First-Person Shooter | Nov 14, 2008 | |
| Oscar's Trash Race | 2600 | Action | 1983 | |
| Othello | 2600 | Board | 1978 | |
| Outlaw | 2600 | Action | 1978 | |
| Atari Outlaw | IP | Action | Nov 1, 2012 |
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