| Sinclair ZX Spectrum cass. |  Magnetron | 198? | MCM Soft. Spain |
| Sinclair ZX Spectrum cass. |  Malice In Wonderland | 198? | Sentient Soft. |
| Sinclair ZX Spectrum cass. | Manic Miner | 198? | Software Projects, Ltd. |
| Sinclair ZX Spectrum cass. | Manic Miner Model IS 0292 | 198? | MAD Mastertronic Added Dimension |
| Sinclair ZX Spectrum cass. | Manor of Doom | 198? | Krypton Force, Ltd. |
| Sinclair ZX Spectrum cass. | Mantronix | 198? | Zafi Chip |
| Sinclair ZX Spectrum cass. | Marble Madness | 198? | Dro Soft. Madrid, Spain |
| Sinclair ZX Spectrum cass. | Mario Bros | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Marsport | 198? | Dro Soft. Madrid, Spain |
| Sinclair ZX Spectrum cass. | MASK | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | MASK II | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | MASK II Serie Leyenda | 198? | IBSA Spain |
| Sinclair ZX Spectrum cass. | MASK Serie Leyenda | 198? | IBSA Spain |
| Sinclair ZX Spectrum cass. | Master Chess | 198? | Dro Soft. Madrid, Spain |
| Sinclair ZX Spectrum cass. | Masters of the Universe - The Movie | 198? | Kixx 013442 |
| Sinclair ZX Spectrum cass. | Match Day | 198? | Zafiro Soft. Div. Spain |
| Sinclair ZX Spectrum cass. | Match Day 2 | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Matchmaker | 198? | Zenobi Soft. |
| Sinclair ZX Spectrum cass. | MAX | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. |  Maxi ZX Spectrum | 198? | Pubblirome Italy |
| Sinclair ZX Spectrum cass. | Maze Death Race | 198? | Spectrum Vision Spain |
| Sinclair ZX Spectrum cass. | Mega-Apocalypse | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Meganova the Weapon Model AS700 | 198? | Alternative Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Metalyx | 198? | System 4 de Espana, S.A. Spain |
| Sinclair ZX Spectrum cass. | Meteor Storm + Space Invaders | 198? | Investronica Spain |
| Sinclair ZX Spectrum cass. | Metropol | 198? | Zafiro Soft. Div. Spain |
| Sinclair ZX Spectrum cass. | Miami Vice | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Mickey Mouse | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Micro Maze | 198? | Krypton Force, Ltd. |
| Sinclair ZX Spectrum cass. | Microball | 198? | System 4 de Espana, S.A. Spain |
| Sinclair ZX Spectrum cass. | Microchess | 198? | Investronica Spain |
| Sinclair ZX Spectrum cass. | Microfair Madness | 198? | Zenobi Soft. |
| Sinclair ZX Spectrum cass. | Microprose Soccer | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Mike Read's Pop Quiz | 198? | Encore 012189 |
| Sinclair ZX Spectrum cass. | Mille Miles Model SP 016 | 198? | Sprites France |
| Sinclair ZX Spectrum cass. | Millimon | 198? | Dixons |
| Sinclair ZX Spectrum cass. | Millionaire | 198? | Currys |
| Sinclair ZX Spectrum cass. | Millypede | 198? | Custom Cables International |
| Sinclair ZX Spectrum cass. | Mines of Saturn + Return to Earth | 198? | Mikro-Gen UK |
| Sinclair ZX Spectrum cass. | Missile Defence | 198? | Currys |
