| 2022-09-04 | Omeyad | Ubi Soft | 1989 |
| 2024-03-10 | On Cue | Mastertronic | 1987 |
| 2024-07-01 | On the Bench | Cult | 1988 |
| 2024-06-15 | On the Oche | Artic Computing | 1984 |
| 2016-04-15 | On the Run | Firebird / Silverbird | 1985 |
| 2014-06-05 | Once a Knight is Enough | Amster Productions | 1991 |
| 2024-09-13 | One | Epyx / D3M Software | 1986 |
| 2025-03-22 | One Man and His Droid | Mastertronic | 1985 |
| 2023-11-02 | One Wonder (CPCRetroDev 2023) | | 2023 |
| 2014-06-07 | One-on-one | Ariolasoft | 1985 |
| 2022-08-10 | Onedin-Line | Schneider Aktiv | 1986/1987 |
| 2021-06-01 | Open Tower Defense | Resistance | 2021 |
| 2023-07-09 | Operation Alexandra (1st CPCRetroDev 2018) | 4Mhz | 2018 |
| 2021-06-05 | Operation Barbarossa | Strategy Software | 1989 |
| 2025-02-23 | Operation Colossus | Argus Press | 1985 |
| 2020-09-18 | Operation Desert Storm | | 1995 |
| 2018-10-15 | Operation Gunship | Codemasters | 1989 |
| 2024-03-30 | Operation Hanoi | Players | 1990 |
| 2024-04-27 | Operation Hongkong | Golden Games | 19xx |
| 2012-08-25 | Operation Hormuz | Again Again | 1989 |
| 2016-05-19 | Operation Nemo | Coktel Vision | 1987 |
| 2018-08-25 | Operation Omega | CPC Revue / Bib Computer | 1985/1987 |
| 2019-01-08 | Operation Program Cleaner | | 1991 |
| 2024-05-19 | Operation Sertun | Amstrad Semanal | 1987 |
| 2025-07-21 | Operation Thunderbolt | Ocean | 1989 |
| 2025-07-21 | Operation Thunderbolt (GX4000) | Ocean | 1990 |
| 2023-02-12 | Operation Wolf | Ocean | 1988 |
| 2014-12-23 | Operation Wolf: Plusedition | Ocean | 20xx |
| 2023-02-12 | Operation Wolf (version Magnum Lightphaser) | Ocean | 1988 |
| 2020-07-29 | Operations a Trous (Jean Reingot) | CPC HS / CPC Revue | 1988 |
| 2012-08-25 | Opetrous | | 1987 |
| 2023-09-10 | OPQA vs. QAOP: The Final Battle (5th CPCRetroDev 2018) | | 2018 |
| 2020-05-12 | Orb Quest | WOW Software | 1990 |
| 2021-06-27 | Orbit Chicane | Computronic | 1987 |
| 2025-02-19 | Orc's Lair (The Amstrad Games Book) | Pitman Publishing | 1984 |
| 2014-12-11 | Orc's Dungeon (2ND @ CPCRETRODEV 2014) | Fracture Games | 2014 |
| 2025-01-31 | Ordipuz | Infomedia | 1987 |
| 2015-02-15 | Oriental Games | Micro Style / Firebird / Microprose | 1990 |
| 2023-09-18 | Orion | Audimicro | 19xx |
| 2024-04-25 | Orion Prime | Arkos / Cargosoft | 2009 |
| 2025-04-10 | Orion (Star Division) | Star Division | 1985 |
| 2018-07-27 | Ormen Slange | | 1987/2018 |
| 2020-02-18 | Ormuz | Genesis Soft / IBER Soft | 1988 |
| 2023-04-02 | Orphée: Le voyage aux enfers | Loriciel | 1985 |
| 2012-08-25 | Ortho-CM | Micro-c | 1986 |
| 2020-07-29 | Ortho-Loup | CPC HS / CPC Revue | 1988 |
| 2013-05-03 | Ortho-Repere
Repere Orthonorme | Cobra Soft | 1986 |
| 2020-07-29 | Orthochiffre (D.Cantillac) | CPC HS / CPC Revue | 1988 |
| 2013-04-11 | Orthocrack | Hatier | 198x |
| 2020-02-18 | Orthographe: Ecrire sans fautes volume 1 | Cedic-Nathan | 198x |
| 2014-12-13 | Orthographe: Ecrire sans fautes volume 2 | Cedic-Nathan | 198x |
| 2017-01-11 | Orthogus tome 1 (CF1) | V.T.A / E Lud | 1989 |
| 2023-08-02 | Orthogus tome 2 | V.T.A / E Lud | 1989 |
| 2017-01-11 | Orthogus tome 3 | V.T.A / E Lud | 1989 |
| 2017-01-11 | Orthogus tome 4 | V.T.A / E Lud | 1989 |
| 2022-09-04 | Orthustrad | CORE | 1985 |
| 2012-12-20 | Ortwin's Run | CPC Amstrad International / northern Software | 1986 |
| 2025-02-23 | Oscar in a Jam | Argus Press | 1985/1986 |
| 2024-08-17 | Osotos | | 2024 |
| 2023-09-06 | Osprey! | Bourne Educational Software / Amsoft | 1984 |
| 2018-08-15 | Otelo (Amstrad Semanal) | Amstrad Semanal | 1985 |
| 2023-04-01 | Othello | Amstar | 1987 |
| 2021-10-18 | Othello | Gerdes / BBG Software | 1985 |
| 2023-04-01 | Othello (Amstrad Magazine)
Othela | Amstrad Magazine | 1986 |
| 2013-05-05 | Othello (Hebdogiciel) | Hebdogiciel | 1985 |
| 2025-11-25 | Othello Master | Power Soft | 1985 |
| 2025-02-20 | Othello (Computer Challenges for the Amstrad) | Duckworth | 1985 |
| 2024-08-31 | Othello (Computing with the Amstrad) | Computing with the Amstrad | 1986 |
| 2018-03-20 | Othello (Jeux & Stratégie) | Jeux et Strategie | 1986 |
| 2025-01-31 | Othellus | infomedia | 198x |
| 2021-06-11 | Otti's Super Sound | Homecomputer | 1985 |
| 2025-09-16 | Out of this World | Reaktor / Ariolasoft | 1987 |
| 2016-03-10 | Out of this World (Andrew Richards) | Boxsoft | 1987/2016/ |
| 2025-07-21 | Out Run | Usgold / Sega | 1987 |
| 2025-07-21 | Out Run Europa
OutRun Europa | Usgold | 1991 |
| 2018-02-26 | Outboard | Loriciel | 1990 |
| 2018-11-24 | Outlaw | Players | 1990 |
| 2022-12-22 | Outlaws (1st @ CPCRetroDev 2016)
Outlaws Reloaded | Retro Bytes Productions | 2016/2017 |
| 2013-08-14 | Overdrive | Your Computer | 1985 |
| 2018-11-13 | Overheap (24th @ CPCRetroDev 2018) | BastaCPC | 2018 |
| 2025-01-15 | Overkoban | Futility Games | 2013 |
| 2014-08-02 | Overlander | Elite | 1988 |
| 2018-02-17 | Overlord 2 | Amsoft | 1984 |
| 2020-11-21 | OVNI Samurai (30th @ CPCRetroDev 2020) | Real Bacon Studio | 2020 |
| 2020-09-04 | Ovo | | 2019 |
| 2013-04-22 | Owl-phabet | The Amstrad User / Amsoft | 1985 |
| 2012-12-27 | Oxi | CPC Amstrad International | 1986 |
| 2023-01-30 | Oxphar | ERE Informatique | 1987 |
| 2013-07-22 | Oxyda
O.x.y.d.a | CPC Revue | 1987 |
| 2023-05-13 | Oxygène | Jumbosoft / Micro-Passion | 1987 |
| 2021-04-22 | Oxysudis | CPCinfos | 1990 |
| 2012-08-25 | Pépé Bequilles
Pepe Muletas | Softhawk | 1987 |
| 2013-05-03 | P*man Goes Planting | Amstrad Computer User | 1985 |
| 2025-02-01 | P47 Freedom Fighter
P-47: Thunderbolt | Firebird | 1989 |
| 2022-05-16 | P4: Return to Ganymede | | 2022 |
| 2023-03-27 | Pac Girl 1 | CPCinfos | 1992 |
| 2021-06-28 | Pac Man | Computronic | 198x |
| 2014-12-05 | Pac Man (Frederic Carbonero) | AM-Mag | 1988 |
| 2021-04-22 | Pac-ball 2 | CPCinfos | 1991 |
| 2020-05-08 | Pac-boy | Ros Soft / Micromag | 1989 |
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