| 14 | One Hundred and Eighty! | ZX-Spectrum 48K | English |
| 42665 | One Key Tapeworm | ZX-Spectrum 48K | English |
| 34701 | One Kick | ZX-Spectrum 16K | English |
| 45191 | One Knight Stand | ZX-Spectrum 128K | English |
| 36146 | One Last Thing | ZX-Spectrum 128 +3 | English |
| 36147 | One Last Thing | ZX-Spectrum Next | English |
| 30921 | One Life Invaders | - | English |
| 24170 | One Line Flight Simulator | ZX-Spectrum 48K | English |
| 31956 | One Little Ghost | ZX81 16K | English |
| 3523 | One Man and His Droid | ZX-Spectrum 48K | English |
| 3525 | One Man and His Droid II | ZX-Spectrum 128K | English |
| 25599 | One Man and His Job | ZX-Spectrum 48K | English |
| 15478 | One More Big Disk | ZX-Spectrum 128 +3 | English |
| 7628 | One Too Many 2: The Total Piss-Up | ZX-Spectrum 128K | English |
| 7629 | One Too Many 3 | ZX-Spectrum 128K | English |
| 3522 | One for the Road | ZX-Spectrum 48K | English |
| 12349 | One for the Road + Mutations | ZX-Spectrum 48K | English |
| 6759 | One of our Wombats is Missing | ZX-Spectrum 48K | English |
| 3526 | One on One | ZX-Spectrum 48K | English |
| 10016 | One-Arm Bandit | ZX-Spectrum 48K | English |