| APPLICATIONS | Omega Scroll (Amstrad Computer User) | 1991 |
| GAMELIST | Omeganea | 1986/1987 |
| GAMELIST | Omeyad | 1989 |
| DEMOSCENE | Omicron Demo | 1990 |
| GAMELIST | On Cue | 1987 |
| GAMELIST | On the Bench | 1988 |
| GAMELIST | On the Oche | 1984 |
| GAMELIST | On the Run | 1985 |
| DEMOSCENE | On-Screen Effects On the CPC464 (Popular Computing Weekly)  | 1984 |
| GAMELIST | Once a Knight is Enough | 1991 |
| DEMOSCENE | Onda Senoidal Tridimensional (Amstrad User) | 1986 |
| GAMELIST | One | 1986 |
| APPLICATIONS | One Dimensional Automata (Computing with the Amstrad) | 1987 |
| GAMELIST | One Man and His Droid | 1985 |
| GAMELIST | One Wonder (CPCRetroDev 2023) | 2023 |
| APPLICATIONS | One-line Entertainer | 1988 |
| DEMOSCENE | One-line Irish Washer-woman (Amstrad Action) | 1991 |
| GAMELIST | One-on-one | 1985 |
| GAMELIST | Onedin-Line | 1986/1987 |
| DEMOSCENE | Onzieme sonate de MOZART (CPC Revue) | 1986 |
| GAMELIST | Open Tower Defense | 2021 |
| APPLICATIONS | Operarateurs Logiques (CPC Infos) | 1990/1991 |
| GAMELIST | Operation Alexandra (1st CPCRetroDev 2018) | 2018 |
| GAMELIST | Operation Barbarossa | 1989 |
| APPLICATIONS | Operation Caretaker (Alignment+ Program/Kit de mantenimiento) | 198x |
| GAMELIST | Operation Colossus | 1985 |
| GAMELIST | Operation Desert Storm | 1995 |
| GAMELIST | Operation Gunship | 1989 |
| GAMELIST | Operation Hanoi | 1990 |
| GAMELIST | Operation Hongkong | 19xx |
| GAMELIST | Operation Hormuz | 1989 |
| GAMELIST | Operation Nemo | 1987 |
| DEMOSCENE | Operation OCRAA | 19xx |
| GAMELIST | Operation Omega | 1985/1987 |
| GAMELIST | Operation Program Cleaner | 1991 |
| GAMELIST | Operation Sertun | 1987 |
| GAMELIST | Operation Thunderbolt | 1989 |
| GAMELIST | Operation Thunderbolt (GX4000) | 1990 |
| GAMELIST | Operation Wolf | 1988 |
| GAMELIST | Operation Wolf: Plusedition | 20xx |
| GAMELIST | Operation Wolf (version Magnum Lightphaser) | 1988 |
| GAMELIST | Operations a Trous (Jean Reingot) | 1988 |
| GAMELIST | Opetrous | 1987 |
| SLIDESHOW | Ophelie Winter Slideshow (Digital Dream) | 199x |
| GAMELIST | OPQA vs. QAOP: The Final Battle (5th CPCRetroDev 2018) | 2018 |
| SLIDESHOW | Optix 1 | 1995 |
| SLIDESHOW | Optix 2 | 2001 |
| APPLICATIONS | Orakel (CPC Amstrad International) | 1987 |
| GAMELIST | Orb Quest | 1990 |
| GAMELIST | Orbit Chicane | 1987 |
| GAMELIST | Orc's Lair (The Amstrad Games Book) | 1984 |
| GAMELIST | Orc's Dungeon (2ND @ CPCRETRODEV 2014) | 2014 |
| APPLICATIONS | Ordi Tiercé/OrdiTiercé | 1985 |
| APPLICATIONS | Ordidactic | 198x |
| GAMELIST | Ordipuz | 1987 |
| APPLICATIONS | Orga-Datei | 198x |
| APPLICATIONS | Orga-Text | 198x |
| APPLICATIONS | Organisateur de Fichiers Disquettes | 19xx |
| APPLICATIONS | Organo Electronico | 1987 |
| APPLICATIONS | Orgel-Champ (Compute Mit) | 1987 |
| APPLICATIONS | Orgue (Ludovic Debono) | 1986 |
| GAMELIST | Oriental Games | 1990 |
| CODING SRC'S | Origins (Computing With the Amstrad) | 1985 |
| GAMELIST | Orion | 19xx |
| GAMELIST | Orion Prime  | 2009 |
| SLIDESHOW | Orion (Digital Dream) | 199x |
| GAMELIST | Orion (Star Division) | 1985 |
| GAMELIST | Ormen Slange | 1987/2018 |
| GAMELIST | Ormuz | 1988 |
| GAMELIST | Orphée: Le voyage aux enfers | 1985 |
| APPLICATIONS | Orpheus | 198x |
| GAMELIST | Ortho-CM | 1986 |
| GAMELIST | Ortho-Loup | 1988 |
| GAMELIST | Ortho-Repere
Repere Orthonorme | 1986 |
| GAMELIST | Orthochiffre (D.Cantillac) | 1988 |
| GAMELIST | Orthocrack | 198x |
| GAMELIST | Orthographe: Ecrire sans fautes volume 1 | 198x |
| GAMELIST | Orthographe: Ecrire sans fautes volume 2 | 198x |
| GAMELIST | Orthogus tome 1 (CF1) | 1989 |
| GAMELIST | Orthogus tome 2 | 1989 |
| GAMELIST | Orthogus tome 3 | 1989 |
| GAMELIST | Orthogus tome 4 | 1989 |
| GAMELIST | Orthustrad | 1985 |
| GAMELIST | Ortwin's Run | 1986 |
| GAMELIST | Oscar in a Jam | 1985/1986 |
| GAMELIST | Osotos | 2024 |
| GAMELIST | Osprey! | 1984 |
| APPLICATIONS | Ostfriesenrechner (Schneider Aktiv Special) | 1987 |
| GAMELIST | Otelo (Amstrad Semanal) | 1985 |
| GAMELIST | Othello | 1987 |
| GAMELIST | Othello | 1985 |
| GAMELIST | Othello (Amstrad Magazine)
Othela | 1986 |
| GAMELIST | Othello (Hebdogiciel) | 1985 |
| GAMELIST | Othello Master | 1985 |
| GAMELIST | Othello (Computer Challenges for the Amstrad) | 1985 |
| GAMELIST | Othello (Computing with the Amstrad) | 1986 |
| GAMELIST | Othello (Jeux & Stratégie) | 1986 |
| GAMELIST | Othellus | 198x |
| APPLICATIONS | Otro camino hacia la compatibilidad (Amstrad User) | 1986 |
| GAMELIST | Otti's Super Sound | 1985 |
