| 29002 | Island Kingdom | ZX81 16K | English |
| 37124 | Isle of Jobo | ZX-Spectrum 48K | English |
| 2559 | It's Only Rock 'n' Roll | ZX-Spectrum 48K | English |
| 19325 | It's Only Rock'N'Roll | ZX-Spectrum 48K | English |
| 19262 | Jahid | ZX-Spectrum 48K | English |
| 2585 | Jerico 2 | ZX-Spectrum 48K | English |
| 2586 | Jerrybuilder | ZX-Spectrum 48K | English |
| 2632 | Joe's Drink Stand | ZX-Spectrum 48K | German |
| 2639 | Jolly Roger | ZX-Spectrum 48K | English |
| 29549 | Jolly Roger | ZX81 16K | English |
| 24393 | Juego Mercantil Nuevo Mundo | ZX-Spectrum 48K | Spanish |
| 2665 | Just Imagine | ZX-Spectrum 48K | English |
| 29007 | Kamel | ZX81 16K | German |
| 27571 | King | ZX-Spectrum 48K | Russian |
| 37380 | King | ZX-Spectrum 48K | Czech |
| 9879 | King Arthur | ZX-Spectrum 48K | English |
| 30469 | Kingdom | ZX-Spectrum 48K | English |
| 18713 | Kingdom | ZX-Spectrum 16K | English |
| 14511 | Klondike | ZX-Spectrum 48K | English |
| 36625 | Klops de'Luxe | ATM | Multi-language: English, Russian |