| 10013 | Oil Strike | ZX-Spectrum 48K | English |
| 40477 | Ol' Faithful | ZX80 | English |
| 27239 | Olaf the Viking | ZX-Spectrum 128K | English |
| 25077 | Old MacDonald's Farm | ZX-Spectrum 48K | - |
| 39372 | Olimpíadas de Física 86 | ZX-Spectrum 48K | Portuguese |
| 8518 | Ollie Octopus' Sketchpad | ZX-Spectrum 16K | English |
| 11969 | Olympics 84 | ZX-Spectrum 48K | English |
| 44638 | Omla Merkkejä | ZX-Spectrum 16K/48K | Finnish |
| 23905 | Op-Amp | ZX-Spectrum 48K | English |
| 14358 | Operaciones Matematicas | ZX-Spectrum 48K | Spanish |
| 19977 | Opposites | ZX-Spectrum 48K | English |
| 24983 | Optyka | ZX-Spectrum 48K | Polish |
| 16708 | Orbis Pictus - Angličtina 1 | ZX-Spectrum 48K | Czech |
| 16714 | Orbis Pictus - Němčina 1 | ZX-Spectrum 48K | Czech |
| 44515 | Orbis Pictus - Němčina 2 | ZX-Spectrum 48K | Czech |
| 23734 | Ordering | ZX-Spectrum 48K | English |
| 36566 | Ordlek | ZX-Spectrum 48K | Norwegian |
| 9150 | Orm and Cheep: Narrow Squeaks | ZX-Spectrum 48K | English |
| 9151 | Orm and Cheep: The Birthday Party | ZX-Spectrum 48K | English |
| 37546 | Ortografia | ZX-Spectrum 48K | Spanish |