| 2001433 | Ocho Quilates: Una Historia de la Edad de Oro del Software Espanol (1) | - | Spanish |
| 6755 | Odisea | ZX-Spectrum 48K | Spanish |
| 27452 | Odisea 1001 | ZX-Spectrum 48K | Spanish |
| 16179 | Odissey | ZX-Spectrum 48K | Spanish |
| 18929 | Offside: The Soccer Game | ZX-Spectrum 48K | Spanish |
| 36572 | Ogerox en los Dominios del Fuego | ZX-Spectrum 48K | Spanish |
| 16326 | Ognom | ZX-Spectrum 48K | Spanish |
| 36844 | Oh Mummy 2021 | ZX-Spectrum 48K | Spanish |
| 36711 | Oklahoma Chons | ZX-Spectrum 48K | Spanish |
| 15788 | Oldman | ZX-Spectrum 48K | Spanish |
| 16138 | Oleoducto | ZX-Spectrum 48K | Spanish |
| 44932 | Olimpia 3D | ZX-Spectrum 16K | Spanish |
| 39541 | Olimpiadas | ZX-Spectrum 16K/48K | Spanish |
| 42848 | Olimpiadas | ZX-Spectrum 48K | Spanish |
| 16323 | Olimpiadas | ZX-Spectrum 48K | Spanish |
| 16413 | Olimpic | ZX-Spectrum 48K | Spanish |
| 6758 | Olimpo en Guerra | ZX-Spectrum 48K | Spanish |
| 16238 | Olimpus | ZX-Spectrum 48K | Spanish |
| 1395 | Omega Dimension | ZX-Spectrum 48K/128K | Spanish |
| 16251 | Omegatrom | ZX-Spectrum 48K | Spanish |