| 2021-08-02 | Old Shurehand  | 1985 |
| 2021-04-23 | Old West | 2021 |
| 2024-06-15 | Ole, Toro | 1985 |
| 2020-02-19 | Oliver Rand | 1985 |
| 2014-07-18 | Olli And Lissa 3: The Candlelight Adventure | 1989 |
| 2012-08-25 | Olli And Lissa: the Ghost Of Shilmoore Castle | 1987 |
| 2023-03-17 | Olympe | 1985 |
| 2016-12-21 | Olympiad '86 | 1986 |
| 0000-00-00 | Olympic kniffel | 1990 |
| 2015-10-02 | Olympic Souris | 1987 |
| 2014-07-12 | Omega Dimension
Dimension Omega | 1989 |
| 2023-08-20 | Omega Planète Invisible
Omega der Geheime Planet | 1987 |
| 2021-08-06 | Omeganea | 1986/1987 |
| 2022-09-04 | Omeyad | 1989 |
| 2024-03-10 | On Cue | 1987 |
| 2024-07-01 | On the Bench | 1988 |
| 2024-06-15 | On the Oche | 1984 |
| 2016-04-15 | On the Run | 1985 |
| 2014-06-05 | Once a Knight is Enough | 1991 |
| 2024-09-13 | One  | 1986 |
| 2023-05-22 | One Man and His Droid | 1985 |
| 2023-11-02 | One Wonder (CPCRetroDev 2023) | 2023 |
| 2014-06-07 | One-on-one | 1985 |
| 2022-08-10 | Onedin-Line | 1986/1987 |
| 2021-06-01 | Open Tower Defense | 2021 |
| 2023-07-09 | Operation Alexandra (1st CPCRetroDev 2018) | 2018 |
| 2021-06-05 | Operation Barbarossa | 1989 |
| 2020-09-18 | Operation Desert Storm | 1995 |
| 2018-10-15 | Operation Gunship | 1989 |
| 2024-03-30 | Operation Hanoi | 1990 |
| 2024-04-27 | Operation Hongkong | 19xx |
| 2012-08-25 | Operation Hormuz | 1989 |
| 2016-05-19 | Operation Nemo | 1987 |
| 2018-08-25 | Operation Omega | 1985/1987 |
| 2019-01-08 | Operation Program Cleaner | 1991 |
| 2024-05-19 | Operation Sertun | 1987 |
| 2021-09-17 | Operation Thunderbolt | 1989 |
| 2014-05-04 | Operation Thunderbolt (GX4000) | 1990 |
| 2023-02-12 | Operation Wolf | 1988 |
| 2014-12-23 | Operation Wolf: Plusedition | 20xx |
| 2023-02-12 | Operation Wolf (version Magnum Lightphaser) | 1988 |
| 2020-07-29 | Operations a Trous (Jean Reingot) | 1988 |
| 2012-08-25 | Opetrous | 1987 |
| 2023-09-10 | OPQA vs. QAOP: The Final Battle (5th CPCRetroDev 2018) | 2018 |
| 2020-05-12 | Orb Quest | 1990 |
| 2021-06-27 | Orbit Chicane | 1987 |
| 2014-12-11 | Orc's Dungeon (2ND @ CPCRETRODEV 2014) | 2014 |
| 2015-10-04 | Ordipuz | 1987 |
| 2015-02-15 | Oriental Games | 1990 |
| 2023-09-18 | Orion | 19xx |
| 2024-04-25 | Orion Prime | 2009 |
| 2018-07-27 | Ormen Slange | 1987/2018 |
| 2020-02-18 | Ormuz | 1988 |
| 2023-04-02 | Orphée: Le voyage aux enfers | 1985 |
| 2012-08-25 | Ortho-CM | 1986 |
| 2020-07-29 | Ortho-Loup | 1988 |
| 2013-05-03 | Ortho-Repere
Repere Orthonorme | 1986 |
| 2020-07-29 | Orthochiffre (D.Cantillac) | 1988 |
| 2013-04-11 | Orthocrack | 198x |
| 2020-02-18 | Orthographe: Ecrire sans fautes volume 1 | 198x |
| 2014-12-13 | Orthographe: Ecrire sans fautes volume 2 | 198x |
| 2017-01-11 | Orthogus tome 1 (CF1) | 1989 |
| 2023-08-02 | Orthogus tome 2 | 1989 |
| 2017-01-11 | Orthogus tome 3 | 1989 |
| 2017-01-11 | Orthogus tome 4 | 1989 |
| 2022-09-04 | Orthustrad | 1985 |
| 2012-12-20 | Ortwin's Run | 1986 |
| 2024-08-17 | Osotos | 2024 |
| 2023-09-06 | Osprey! | 1984 |
| 2018-08-15 | Otelo (Amstrad Semanal) | 1985 |
| 2023-04-01 | Othello | 1987 |
| 2021-10-18 | Othello | 1985 |
| 2023-04-01 | Othello (Amstrad Magazine)
Othela | 1986 |
| 2013-05-05 | Othello (Hebdogiciel) | 1985 |
| 2012-08-25 | Othello Master | 1985 |
| 2024-08-31 | Othello (Computing with the Amstrad) | 1986 |
| 2018-03-20 | Othello (Jeux & Stratégie) | 1986 |
| 2021-06-11 | Otti's Super Sound | 1985 |
| 2024-03-26 | Out of this World | 1987 |
| 2016-03-10 | Out of this World (Andrew Richards) | 1987/2016/ |
| 2023-08-20 | Out Run | 1987 |
| 2018-10-27 | Out Run Europa
OutRun Europa | 1991 |
| 2018-02-26 | Outboard | 1990 |
| 2018-11-24 | Outlaw | 1990 |
| 2022-12-22 | Outlaws (1st @ CPCRetroDev 2016)
Outlaws Reloaded | 2016/2017 |
| 2013-08-14 | Overdrive | 1985 |
| 2018-11-13 | Overheap (24th @ CPCRetroDev 2018) | 2018 |
| 2013-08-04 | Overkoban | 2013 |
| 2014-08-02 | Overlander | 1988 |
| 2018-02-17 | Overlord 2 | 1984 |
| 2020-11-21 | OVNI Samurai (30th @ CPCRetroDev 2020) | 2020 |
| 2020-09-04 | Ovo | 2019 |
| 2013-04-22 | Owl-phabet | 1985 |
| 2012-12-27 | Oxi | 1986 |
| 2023-01-30 | Oxphar | 1987 |
| 2013-07-22 | Oxyda
O.x.y.d.a | 1987 |
| 2023-05-13 | Oxygène | 1987 |
| 2021-04-22 | Oxysudis | 1990 |
| 2012-08-25 | Pépé Bequilles
Pepe Muletas | 1987 |
| 2013-05-03 | P*man Goes Planting | 1985 |
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