| Atari 400/800 cart. |  Night Strike! | 1983 | TG Soft. |
| Atari 400/800 cart. | Oil's Well | 1983 | Sierra On-Line, Inc. USA 20626 |
| Atari 400/800 cart. | Orc Attack | 1983 | Thorn EMI Video, Ltd. UK |
| Atari 400/800 cart. | Ozzy's Orchard | 1983 | TG Soft. |
| Atari 400/800 cart. | Pac-Man Model CXL4022 | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Pac-Man Model RX8022 | 1986 | Atari Corp. CA, USA |
| Atari 400/800 cart. | Pastfinder Model CC-104 | 1984 | Activision, Inc. Mountain View, CA, USA 47875 |
| Atari 400/800 cart. | Peanut Butter Panic Model 4L-0110 | 1984 | CBS Soft. |
| Atari 400/800 cart. | Pengo Model RX8045 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Picnic Paranoia | 1982 | Synapse Soft. Corp. |
| Atari 400/800 cart. | Pitfall II - Lost Caverns | 1984 | Activision, Inc. Mountain View, CA, USA 47875 |
| Atari 400/800 cart. | Pitfall II - Lost Caverns Model CA-011 | 1984 | Activision, Inc. Mountain View, CA, USA 47875 |
| Atari 400/800 cart. | Pitfall! Model CZ-004 | 1984 | Activision, Inc. Mountain View, CA, USA 47875 |
| Atari 400/800 cart. | Pitstop Model 604R | 1983 | Epyx, Inc. Redwood City, CA, USA |
| Atari 400/800 cart. | PlatterMania Model 554R | 1983 | Epyx, Inc. Redwood City, CA, USA |
| Atari 400/800 cart. |  Pole Position Model RX8034 | 1987 | Atari Corp. CA, USA |
| Atari 400/800 cart. | Pole Position Model RX8034 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Pool 400 | 1982 | IDSI |
| Atari 400/800 cart. | Popeye Model 1150 | 1983 | Parker Bros. Beverly, MA, USA |
| Atari 400/800 cart. | Porky's Model 02033 | 1983 | Romox, Inc. Campbell, CA, USA |
| Atari 400/800 cart. | Powerstar | 1985 | Pandora Soft. |
| Atari 400/800 cart. | Preppie | 2001 | Video 61 |
| Atari 400/800 cart. | Prevue | 1991 | Prevue Networks |
| Atari 400/800 cart. | Prince of Persia P Hb | 2021 | Rensoup |
| Atari 400/800 cart. | Princess and the Frog | 1982 | Romox, Inc. Campbell, CA, USA |
| Atari 400/800 cart. | Pronto - The Home Information System | 1983 | Pronto |
| Atari 400/800 cart. | Protector II | 1982 | Synapse Soft. Corp. |
| Atari 400/800 cart. | Q*bert Model PB1120 | 1983 | Parker Bros. Beverly, MA, USA |
| Atari 400/800 cart. | Qamus Najm | 198? | aDawliah Universal Electronics APL. Al-Khobar, Saudi Arabia |
| Atari 400/800 cart. | Qix Model CXL4027 | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Queen of Hearts | 1983 | SSI Strategic Simulations, Inc. 16685 |
| Atari 400/800 cart. | Rack 'em Up! | 1983 | Roklan |
| Atari 400/800 cart. | Rally Speedway Model 053-0171 | 1983 | Adventure International |
| Atari 400/800 cart. | RealSports Football Model RX8029 | 1987 | Atari Corp. CA, USA |
| Atari 400/800 cart. | RealSports Football Model RX8029 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Risk | 1983 | Parker Bros. Beverly, MA, USA |
| Atari 400/800 cart. | River Raid Model CZ-001 | 1983 | Activision, Inc. Mountain View, CA, USA 47875 |
| Atari 400/800 cart. | River Rescue Model THB12005 | 1983 | Thorn EMI Video, Ltd. UK |
| Atari 400/800 cart. | Robotron: 2084 Model RX8033 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Ruptus Hb | 2022 | Inufuto |
