| 2024-08-17 | Osotos | 2024 |
| 2025-02-23 | Oscar in a Jam | 1985/1986 |
| 2012-12-20 | Ortwin's Run | 1986 |
| 2022-09-04 | Orthustrad | 1985 |
| 2017-01-11 | Orthogus tome 4 | 1989 |
| 2017-01-11 | Orthogus tome 3  | 1989 |
| 2023-08-02 | Orthogus tome 2 | 1989 |
| 2017-01-11 | Orthogus tome 1 (CF1) | 1989 |
| 2014-12-13 | Orthographe: Ecrire sans fautes volume 2 | 198x |
| 2020-02-18 | Orthographe: Ecrire sans fautes volume 1 | 198x |
| 2013-04-11 | Orthocrack | 198x |
| 2020-07-29 | Orthochiffre (D.Cantillac) | 1988 |
| 2013-05-03 | Ortho-Repere
Repere Orthonorme | 1986 |
| 2020-07-29 | Ortho-Loup | 1988 |
| 2012-08-25 | Ortho-CM | 1986 |
| 2023-04-02 | Orphée: Le voyage aux enfers | 1985 |
| 2020-02-18 | Ormuz | 1988 |
| 2018-07-27 | Ormen Slange | 1987/2018 |
| 2025-04-10 | Orion (Star Division) | 1985 |
| 2024-04-25 | Orion Prime | 2009 |
| 2023-09-18 | Orion | 19xx |
| 2015-02-15 | Oriental Games | 1990 |
| 2025-01-31 | Ordipuz | 1987 |
| 2014-12-11 | Orc's Dungeon (2ND @ CPCRETRODEV 2014) | 2014 |
| 2025-02-19 | Orc's Lair (The Amstrad Games Book) | 1984 |
| 2021-06-27 | Orbit Chicane | 1987 |
| 2020-05-12 | Orb Quest | 1990 |
| 2023-09-10 | OPQA vs. QAOP: The Final Battle (5th CPCRetroDev 2018) | 2018 |
| 2012-08-25 | Opetrous | 1987 |
| 2020-07-29 | Operations a Trous (Jean Reingot) | 1988 |
| 2023-02-12 | Operation Wolf (version Magnum Lightphaser) | 1988 |
| 2014-12-23 | Operation Wolf: Plusedition | 20xx |
| 2023-02-12 | Operation Wolf | 1988 |
| 2025-07-21 | Operation Thunderbolt (GX4000) | 1990 |
| 2025-07-21 | Operation Thunderbolt | 1989 |
| 2024-05-19 | Operation Sertun | 1987 |
| 2019-01-08 | Operation Program Cleaner | 1991 |
| 2018-08-25 | Operation Omega | 1985/1987 |
| 2016-05-19 | Operation Nemo | 1987 |
| 2012-08-25 | Operation Hormuz | 1989 |
| 2024-04-27 | Operation Hongkong | 19xx |
| 2024-03-30 | Operation Hanoi | 1990 |
| 2018-10-15 | Operation Gunship | 1989 |
| 2020-09-18 | Operation Desert Storm | 1995 |
| 2025-02-23 | Operation Colossus | 1985 |
| 2021-06-05 | Operation Barbarossa | 1989 |
| 2023-07-09 | Operation Alexandra (1st CPCRetroDev 2018) | 2018 |
| 2021-06-01 | Open Tower Defense | 2021 |
| 2022-08-10 | Onedin-Line | 1986/1987 |
| 2014-06-07 | One-on-one | 1985 |
| 2023-11-02 | One Wonder (CPCRetroDev 2023) | 2023 |
| 2025-03-22 | One Man and His Droid | 1985 |
| 2024-09-13 | One | 1986 |
| 2014-06-05 | Once a Knight is Enough | 1991 |
| 2016-04-15 | On the Run | 1985 |
| 2024-06-15 | On the Oche | 1984 |
| 2024-07-01 | On the Bench | 1988 |
| 2024-03-10 | On Cue | 1987 |
| 2022-09-04 | Omeyad | 1989 |
| 2021-08-06 | Omeganea | 1986/1987 |
| 2023-08-20 | Omega Planète Invisible
Omega der Geheime Planet | 1987 |
| 2025-03-17 | Omega Dimension
Dimension Omega | 1989 |
| 2015-10-02 | Olympic Souris | 1987 |
| 0000-00-00 | Olympic kniffel | 1990 |
| 2016-12-21 | Olympiad '86 | 1986 |
| 2024-12-30 | Olympe | 1985 |
| 2025-02-25 | Olli And Lissa: The Ghost of Shilmoore Castle | 1987 |
| 2014-07-18 | Olli And Lissa 3: The Candlelight Adventure | 1989 |
| 2020-02-19 | Oliver Rand | 1985 |
| 2024-06-15 | Ole, Toro | 1985 |
| 2021-04-23 | Old West | 2021 |
| 2021-08-02 | Old Shurehand
Old Surehand | 1985 |
| 2014-03-25 | Old Scores | 1986 |
| 2024-06-10 | Old Sam's Saloon Gamble Machine | 1989 |
| 2024-07-06 | Oink! | 1987 |
| 2024-03-13 | Oilmania | 1990 |
| 2022-04-01 | Oil Panic (Amstrad Magazine) | 1985 |
| 2012-08-25 | Oil Panic (CPC Revue) | 1988 |
| 2021-04-11 | Oil Panic | 2021 |
| 2020-05-11 | Oil | 1987 |
| 2020-06-15 | OIK | 1988/1989 |
| 2022-10-30 | OH NO, My Moustache! | 2022 |
| 2025-03-14 | Oh Mummy
Oh Momies!
Schatz der Pharaonen | 1984 |
| 2025-11-06 | Oh Mummy Resurrected | 1984/2025 |
| 2024-03-19 | Oh Chute! | 2024 |
| 2021-12-19 | Off Shore Warrior | 1989 |
| 2021-03-18 | Oel
Öl | 1985/1986 |
| 2025-04-01 | Odyssey | 1986 |
| 2020-07-17 | Odds | 1985 |
| 2023-12-04 | Odd One Out (Amstrad Computer User) | 19xx |
| 2023-09-14 | Octopus GX4000 | 2023 |
| 2023-09-14 | Octopus Deluxe | 2023 |
| 2023-11-30 | Octopus 21 | 2023 |
| 2023-09-14 | Octopus | 2021 |
| 2018-10-06 | Octoplex | 1989 |
| 2015-05-28 | Oceano | 2015 |
| 2014-07-30 | Ocean Conqueror | 1988 |
| 2021-09-09 | Obstacle (Amstrad Games Book) | 1985 |
| 2024-06-12 | Obsidian
L'hepiss | 1985 |
| 2018-10-12 | Obliterator | 1989 |
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