| DEMOSCENE | Ocean Loader 4 (Epyteor) | 20xx |
| GAMELIST | Oceano | 2015 |
| APPLICATIONS | Ocp Screens Viewer | 1998 |
| APPLICATIONS | OCP-Pic Expand (CPC Amstrad International) | 1992/1991 |
| DEMOSCENE | OctoBear's 3D-Scroll-Intro | 1992 |
| GAMELIST | Octoplex | 1989 |
| GAMELIST | Octopus | 2021 |
| GAMELIST | Octopus 21 | 2023 |
| GAMELIST | Octopus Deluxe  | 2023 |
| GAMELIST | Octopus GX4000 | 2023 |
| GAMELIST | Odd One Out (Amstrad Computer User) | 19xx |
| GAMELIST | Odds | 1985 |
| DEMOSCENE | Odiesoft - Ripped Sounds | |
| GAMELIST | Odyssey | 1986 |
| APPLICATIONS | Odzyskiwanie Plików Skasowanych Omyłkowo na Dyskietce (Bajtek) | 1986 |
| DEMOSCENE | Oechtel 2 (Oechtel Demo II) | 198x |
| GAMELIST | Oel
Öl | 1985/1986 |
| GAMELIST | Off Shore Warrior | 1989 |
| GAMELIST | Oh Chute! | 2024 |
| GAMELIST | Oh Mummy Resurrected | 1984/2025 |
| GAMELIST | Oh Mummy
Oh Momies!
Schatz der Pharaonen | 1984 |
| GAMELIST | OH NO, My Moustache! | 2022 |
| GAMELIST | OIK | 1988/1989 |
| GAMELIST | Oil | 1987 |
| GAMELIST | Oil Panic | 2021 |
| GAMELIST | Oil Panic (CPC Revue) | 1988 |
| GAMELIST | Oil Panic (Amstrad Magazine) | 1985 |
| GAMELIST | Oilmania | 1990 |
| GAMELIST | Oink! | 1987 |
| DEMOSCENE | OK! Part (Cybord Megademo Preview) | 19xx |
| DEMOSCENE | Okay | |
| GAMELIST | Old Sam's Saloon Gamble Machine | 1989 |
| GAMELIST | Old Scores | 1986 |
| GAMELIST | Old Shurehand
Old Surehand | 1985 |
| GAMELIST | Old West | 2021 |
| DEMOSCENE | Oldschool Intro 1 (Summer Edition) | 2020 |
| GAMELIST | Ole, Toro | 1985 |
| GAMELIST | Oliver Rand | 1985 |
| GAMELIST | Olli And Lissa 3: The Candlelight Adventure | 1989 |
| GAMELIST | Olli And Lissa: The Ghost of Shilmoore Castle | 1987 |
| GAMELIST | Olympe | 1985 |
| GAMELIST | Olympiad '86 | 1986 |
| GAMELIST | Olympic kniffel | 1990 |
| GAMELIST | Olympic Souris | 1987 |
| SLIDESHOW | Omaha (Digital Dream) | 199x |
| GAMELIST | Omega Dimension
Dimension Omega | 1989 |
| GAMELIST | Omega Planète Invisible
Omega der Geheime Planet | 1987 |
| 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 | 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 |
