| 19550 | OXO Anagrams | ZX-Spectrum 48K | English |
| 19551 | OXO Multiplication and Division | ZX-Spectrum 48K | English |
| 12692 | Oasis 1 | ZX-Spectrum 48K | English |
| 3477 | Oberon 69 | ZX-Spectrum 48K | Spanish |
| 28023 | Objectif Elysee | ZX-Spectrum 48K | French |
| 15045 | Objetivo: La Moncloa | ZX-Spectrum 48K | Spanish |
| 14383 | Objetivo: Madrid - Parte 1 | ZX-Spectrum 48K | Spanish |
| 3481 | Oblivion | ZX-Spectrum 48K | English |
| 23395 | Oblivion | ZX-Spectrum 48K | Russian |
| 28123 | Obroty i Symetrie | ZX-Spectrum 48K | Polish |
| 25087 | Obrázky | ZX-Spectrum 48K | Czech |
| 8516 | Observationsprogram | ZX-Spectrum 48K | Danish |
| 42963 | Obstacle Course | ZX-Spectrum 48K | English |
| 18104 | Obstaculos | ZX-Spectrum 48K | Spanish |
| 16301 | Obstaculos | ZX-Spectrum 48K | Spanish |
| 23069 | Occupations Clipart | ZX-Spectrum 48K | English |
| 6754 | Ocean Dancer | ZX-Spectrum 48K | English |
| 24292 | Ocean Defence | ZX-Spectrum 48K | English |
| 14274 | Ocean's Greatest Hits | ZX-Spectrum 48K | English |
| 3483 | Octagon | ZX-Spectrum 48K | English |