| 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 |
| 2026-07-21 | 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 |
| 2026-05-27 | Omeyad | 1989/2026 |
| 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 |
| 2012-08-25 | Objectif Monde 2
Objectif Monde II | 19xx |
| 2012-08-25 | Objectif Monde 1: Milieux Naturels (Gerographie 6eme) | 198x |
| 2012-08-25 | Objectif France | 19xx |
| 2020-01-07 | Objectif Europe Geographique | 198x |
| 2015-07-05 | Objectif Calcul CP
Divisions+Addsous | 1987 |
| 2015-10-05 | Objectif 10000 | 198x |
| 2017-04-03 | Oberon 69 | 1990 |
| 2024-04-16 | Obbiettivo Visitors | 1985 |
| 2015-10-04 | O.M.S | 19xx |
| 2017-03-16 | O'thelo | 1985 |
| 2017-01-31 | O'thelo | 19xx |
| 2012-08-25 | O Tac-tic | 19xx |
| 2022-12-04 | O Grady Says | 1984 |
| 2019-06-02 | Nythyhel: Files of the Occult | 1986 |
| 2015-11-02 | NWO (27th @ CPCRetroDev 2015) | 2015 |
| 2023-04-02 | Numerus | 1985 |
| 2019-08-21 | Numerix (Sybex) | 1984 |
| 2021-05-01 | Numerik | 19xx |
| 2012-08-25 | Numeri | 1990 |
| 2013-08-14 | Numbers Up | 1986 |
| 2014-06-08 | Numbers Minds | 1994 |
| 2023-12-04 | Numbercircle | 1990 |
| 2023-12-10 | NumberBlaster (Amstrad Action) | 1991 |
| 2023-04-02 | Number Swop / Puzzle (Popular Computing Weekly) | 1984 |
| 2023-12-12 | Number Shooter (Amstrad Action) | 1993 |
| 2023-12-04 | Number Series | 1990 |
| 2023-12-11 | Number Scoffer (Amstrad Action) | 1992/1993 |
| 2025-06-25 | Number Painter
El Juego de los Números | 1984 |
| 2019-12-08 | Number game | 1987 |
| 2013-03-03 | Number 11
Sum Fun | 198x |
| 2015-12-31 | Number 1 | 1985 |
| 2023-11-05 | Nuke Bug (CPCRetroDev 2023) | 2023 |
| 2022-12-01 | Nucleo Energetico | /1985/1986/ |
| 2018-05-22 | Nuclear Heist | 1986 |
| 2013-10-01 | Nuclear Defence | 1986 |
| 2022-01-05 | Nuclear Alert | 1988 |
| 2020-07-29 | Nuclear (Gerard Tanniere) | 1988 |
| 2020-04-02 | Nowis | 2019 |
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