| 28675 | Iron Sword | ZX-Spectrum 48K | - |
| 2564 | Jack the Nipper | ZX-Spectrum 48K | English |
| 2566 | Jack the Nipper II: In Coconut Capers | ZX-Spectrum 48K | English |
| 1477 | Jackle & Wide | ZX-Spectrum 48K | English |
| 20288 | Jafag | ZX-Spectrum 48K | English |
| 42658 | Jesus Vs The Romans | ZX-Spectrum 48K | English |
| 2616 | Jméno růže | ZX-Spectrum 128K | Czech |
| 2620 | Joe Blade | ZX-Spectrum 48K/128K | English |
| 2623 | Joe Blade II | ZX-Spectrum 48K/128K | English |
| 2627 | Joe Blade III | ZX-Spectrum 48K/128K | English |
| 2631 | Joe Blade IV | ZX-Spectrum 48K | English |
| 2638 | Jokers Wild | ZX-Spectrum 48K | English |
| 30215 | Journey to Another World | ZX-Spectrum 48K | Multi-language: English, Spanish |
| 11819 | Judge Death | ZX-Spectrum 48K | English |
| 27338 | Jungle Quest | ZX-Spectrum 48K | English |
| 2664 | Jungle Warrior | ZX-Spectrum 48K/128K | Spanish |
| 10844 | Just One of Those Days | ZX-Spectrum 48K | English |
| 27691 | Kachiri | ZX-Spectrum 48K | French |
| 26532 | Kapitoshka | ZX-Spectrum 48K | Russian |
| 2678 | Kat Trap | ZX-Spectrum 48K | English |