| Atari 400/800 cart. |  Leo's 'Lectric Paintbrush | 1983 | Chalkboard, Inc. |
| Atari 400/800 cart. |  Letter Tutor Model RX8071 | 1984 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Lifespan | 1983 | Roklan |
| Atari 400/800 cart. | Linking Logic | 1984 | Fisher-Price |
| Atari 400/800 cart. | Logic Levels | 1984 | Fisher-Price |
| Atari 400/800 cart. | Logic Master | 1983 | Chalkboard, Inc. |
| Atari 400/800 cart. | M*A*S*H Model 01033 | 1982 | Romox, Inc. Campbell, CA, USA |
| Atari 400/800 cart. | Magic Dump II | 1983 | Gemini Soft. |
| Atari 400/800 cart. | Major League Hockey | 1983 | Thorn EMI Video, Ltd. UK |
| Atari 400/800 cart. | MasterType | 1983 | Scarborough Systems, Inc. |
| Atari 400/800 cart. | Math Encounter | 1984 | Hsu Soft. |
| Atari 400/800 cart. | Math Mileage Model 75010 | 1984 | CBS Soft. |
| Atari 400/800 cart. | Math Works - Addition | 1985 | Concepts for Darren |
| Atari 400/800 cart. | Math Works - Subtraction | 1985 | Concepts for Darren |
| Atari 400/800 cart. | Matterhorn | 1984 | Tigervision Tiger Electronic Toys, Inc. Orchard Mundelein, IL, USA |
| Atari 400/800 cart. | Maurauder | 198? | Sierra On-Line, Inc. USA 20626 |
| Atari 400/800 cart. | Mazy Hb | 2022 | Inufuto |
| Atari 400/800 cart. | McDonald's Pac-Mac | 1983 | Parker Bros. Beverly, MA, USA |
| Atari 400/800 cart. | MegaMania Model CZ-003 | 1983 | Activision, Inc. Mountain View, CA, USA 47875 |
| Atari 400/800 cart. | Memory Manor | 1984 | Fisher-Price |
| Atari 400/800 cart. | Meteor | 198? | Germ-Soft |
| Atari 400/800 cart. | Millipede Model RX8048 | 1984 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Miner 2049er | 1982 | Big Five Soft. Van Nuys, CA, USA |
| Atari 400/800 cart. | Missile Command | 1981 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Missile Command Model CXL4012 | 1981 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Missile Command+ | 2006 | Unknown |
| Atari 400/800 cart. | Mogul Maniac Model 03220 | 1983 | Romox, Inc. Campbell, CA, USA |
| Atari 400/800 cart. | Monster Maze Model 564R | 1982 | Automated Simulations, Inc. |
| Atari 400/800 cart. | Montezuma's Revenge | 1984 | Parker Bros. Beverly, MA, USA |
| Atari 400/800 cart. | Moogles | 1983 | Sirius Soft., Inc. Sacramento, CA, USA |
| Atari 400/800 cart. | Moon Patrol Model RX8052 | 1983 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Mountain King Model 4L2541 | 1983 | CBS Soft. |
| Atari 400/800 cart. | Movie Musical Madness Model 4L-9849 | 1984 | CBS Soft. |
| Atari 400/800 cart. | Mr. Cool | 1983 | Sierra On-Line, Inc. USA 20626 |
| Atari 400/800 cart. | Mr. Do!'s Castle | 1984 | Parker Bros. Beverly, MA, USA |
| Atari 400/800 cart. | Mr. TNT | 1983 | HES Human Engineered Soft. |
| Atari 400/800 cart. | Ms. Pac-Man Model RX8043 P | 1982 | Atari, Inc. CA, USA |
| Atari 400/800 cart. | Nautilus | 198? | Synapse Soft. Corp. |
| Atari 400/800 cart. | Necromancer | 198? | Synapse Soft. Corp. |
| Atari 400/800 cart. | Neuras Hb | 2022 | Inufuto |
