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Games beginning with 'O'
| Game | Publisher | Year | Genre |
| Obliterator | Melbourne House | 1989 | Arcade Adventure |
| Oblivion | Alpha-Omega Software | 1986 | Arcade |
Obrotyi Symetrie  |
Polmer | Educational | |
| Ocean Conqueror | Rack-It | 1987 | Simulation |
| The Ocean Dancer | King Software | Adventure | |
| The Ocean Dancer - Alternate | King Software | 1984 | Adventure |
| The Ocean Dancer - Alternate 2 | King Software | 1984 | Adventure |
| The Ocean Dancer - Alternate 3 | King Software | 1984 | Adventure |
| Ocean Racer | Hill MacGibbon | Sports | |
| Ocean Racer (Alternative) | Alternative Software Ltd | Sports | |
| The OCP Art Studio (Datel) | Datel Electronics | Utility | |
| Octagon | Budgie Budget Software | 1987 | Arcade |
| Octagon Squad | Mastertronic Ltd | 1986 | Arcade |
| Octan | Silverbird Software Ltd | 1987 | Arcade |
| Octopus | Hansesoft GmbH | 1984 | Arcade |
| Octopussy | Ultrasoft [2] | 1992 | Arcade Adventure |
| Odbicie Swiatla |
Polmer | Educational | |
| Odczytywanie Skali Miernika |
Polmer | Educational | |
| Odd Ball | The Power House | 1987 | Arcade |
| Odd Job Eddie | Tynesoft | 1986 | Arcade |
| Odd One Out | Griffin Software [2] | 1984 | Educational |
| Oddzial Cobra | Krajowe Wydawnictwo Czasopism | 1986 | Arcade |
| Odyssey 1 | Perfection Software | 1983 | Arcade |
| Odyssey 1 (Softstone) | Softstone Ltd | 1983 | Arcade |
| The Odyssey Of Hope | Martech Games Ltd | 1984 | Adventure |
| Office Master | Gemini Marketing Ltd | 1986 | Utility |
| The Official Father Christmas | Alternative Software Ltd | 1989 | Arcade |
| Oh Mummy | Gem Software | 1984 | Arcade |
| Oh Mummy (Sinclair) | Sinclair Research Ltd | 1984 | Arcade |
| Oil Strike | Sinclair Research Ltd | 1984 | Strategy |
| Oil Tycoon | Global Games | 1985 | Simulation |
| Oink | CRL Group PLC | 1987 | Arcade |
| Oink (Alternative) | Alternative Software Ltd | 1988 | Arcade |
| O.K. Yah | Pirate Software Ltd | 1988 | Arcade |
| Old 49'er |
GLN | 1983 | Strategy |
| Ole Toro (Americana) | Americana Software Ltd | 1986 | Arcade |
| O'Level Computer Science | GCE Tutoring | 1984 | Educational |
| O' Level: CSE Chemistry | Calpac Computer Software | 1982 | Educational |
| O'Level Electronics | GCE Tutoring | 1985 | Educational |
| O'Level Maths | GCE Tutoring | 1986 | Educational |
| O'Level Physics | GCE Tutoring | 1984 | Educational |
| O Level Physics Revision - Light And Heat | Rose Software | 1984 | Educational |
| OlgaI |
Christoph Lütge | 1985 | Adventure |
| Oligopoly - Release 1 | CCS | 1983 | Strategy |
| Oligopoly - Release 2 | CCS | 1983 | Strategy |
| Oliver's Music Box | Cosmic Pop | 1986 | Utility |
| Olli and Lissa | Firebird Software Ltd | 1986 | Arcade |
| Ollie Octopus' Sketchpad | Storm Software | 1983 | Utility |
| Olli & Lissa 3: The Candlelight Adventure | Cartoon Time | 1989 | Arcade |
| Olympiad '86 | Atlantis Software Ltd | 1986 | Sports |
| Olympic Challenge | Century City Software Ltd | 1985 | Sports |
| Olympicon | Mitec | 1984 | Sports |
| Olympics | CRL Group PLC | 1984 | Sports |
| Olympics 84 | Storm Software | 1984 | Educational |
| Olympic Spectacular (Alternative) | Alternative Software Ltd | 1987 | Sports |
| Olympimania | Automata UK Ltd | 1984 | Arcade |
| Omadan Attack | Avalon Software | 1984 | Arcade |
| Omega 1 | Mastertronic Ltd | 1987 | Arcade |
| Omega Run | CRL Group PLC | 1983 | Arcade |
| Ometron | Software Projects Ltd | 1983 | Arcade |
| Omnicalc | Microsphere | 1983 | Utility |
| Omni Calc 2 | Microsphere | 1984 | Utility |
| Omni Calc 2 Expansion & Conversion Kit | Microsphere | 1985 | Utility |
| Omnicopy 2 | Omnisoft | 1985 | Utility |
| Omnicopy 2 - Alternate | Omnisoft | 1985 | Utility |
| Omnicopy 2 - Alternate 2 | Omnisoft | 1985 | Utility |
| Once Upon A Lily Pad | Global Games | 1989 | Adventure |
| On Cue | Mastertronic Added Dimension | 1987 | Arcade |
| One Dark Night | Paul Brunyee | 1988 | Adventure |
| One Dark Night - Alternate | Paul Brunyee | 1988 | Adventure |
| One Day Cricket | CRL Group PLC | 1983 | Sports |
| One For The Road | Tynesoft | 1986 | Arcade |
| One Man And His Droid | Mastertronic Ltd | 1985 | Arcade |
| One Man And His Droid - Alternate | Mastertronic Ltd | 1985 | Arcade |
| One Man And His Droid II | Clive Brooker | 2001 | Arcade |
| One Of Our Wombats Is Missing! | Zenobi Software | 1990 | Adventure |
| One Of Our Wombats Is Missing - Alternate | Zenobi Software | 1990 | Adventure |
| One On One | Ariolasoft UK Ltd | 1985 | Sports |
| One On One (Serma) | Serma | 1985 | Sports |
| On Reflection | Cheese Freak Software | 2007 | Adventure |
| On The Bench | Cult Games | 1988 | Simulation |
| On The Flat | Lambourne Games | 1993 | Strategy |
| On The Oche | Artic Computing Ltd | 1984 | Sports |
| On The Oche (Paxman) | Paxman Promotions | 1984 | Sports |
| On The Ropes II | Lambourne Games | 1987 | Simulation |
| On The Run | Design Design Software | 1985 | Arcade |
| On The Run (Silverbird) | Silverbird Software Ltd | 1985 | Arcade |
| Oops! | The Big Apple | 1988 | Arcade |
| Op-Amp | SciCAL Software Ltd | 1984 | Educational |
| The Open | CCS | 1984 | Sports |
| Operation Alignment | Global Software | 1986 | Utility |
| Operation Berlin | Wrightchoice Software | 1987 | Adventure |
| Operation Caretaker | Global Software | 1985 | Utility |
| Operation Cerberus | Colin Bishop | 1985 | Strategy |
| Operation Colossus | Omega Software [3] | Adventure | |
| Operation Colossus - Alternate | Omega Software [3] | 1986 | Adventure |
| Operation Colossus - Alternate 2 | Omega Software [3] | 1986 | Adventure |
| Operation Gunship | Code Masters | 1990 | Arcade |
| Operation Gunship (Erbe) | Erbe Software | 1989 | Arcade |
| Operation Hanoi | Players Premier | 1990 | Arcade |
| Operation Hormuz | Again Again | 1989 | Arcade |
| Operation Hormuz (Alternative) | Alternative Software Ltd | 1991 | Arcade |
| Operation Hormuz (EDOS) | EDOS | 1989 | Arcade |
| Operation Nightingale | Softly Softly | 1985 | Adventure |
| Operation Stallion | Wrightchoice Software | 1987 | Adventure |
| Operation Thunderbolt | Ocean Software Ltd | 1989 | Arcade |
| Operation Thunderbolt {Portuguese} | Ocean Software Ltd | 1989 | Arcade |
| Operation Thunderbolt (The Hit Squad) | The Hit Squad | 1991 | Arcade |
| Operation Thunderbowel | Sacred Scroll Software | Adventure | |
| Operation Turtle | Pocket Money Software | 1984 | Adventure |
| Operation Turtle - Alternate | Pocket Money Software | 1984 | Adventure |
| Operation Wolf | Ocean Software Ltd | 1988 | Arcade |
| Operation Wolf (The Hit Squad) | The Hit Squad | 1991 | Arcade |
| Opposition | Pulsonic | 1984 | Board Game |
| The Oppressed Land | Zenobi Software | 1994 | Adventure |
| The Oracle's Cave | Doric Computer Services | 1984 | Adventure |
| Orb | Impact Software | 1982 | Adventure |
| Orbiter (Paxman) | Paxman Promotions | 1982 | Arcade |
| Orbiter - Release 1 | Silversoft Ltd | 1982 | Arcade |
| Orbiter - Release 2 | Silversoft Ltd | 1982 | Arcade |
| Orbiter - Release 3 | Silversoft Ltd | 1982 | Arcade |
| Orbit Of Doom | Dave Watson | Adventure | |
| Orbix The Terrorball | Streetwise | 1986 | Arcade |
| Orbix The Terrorball (Bug-Byte) | Bug-Byte Software Ltd | 1986 | Arcade |
| Orb Quest | Paul And Timothy Stitt | Adventure | |
| Orb Quest - Alternate | The Guild | 1991 | Adventure |
| Orc Attack | Creative Sparks | 1984 | Arcade |
| Orc Attack (Sparklers) | Sparklers | 1984 | Arcade |
| Orc Attack (Top Ten) | Top Ten Software | 1984 | Arcade |
| Orchestra | Warm Circuit | Utility | |
| Orc Island | 1984 | Adventure | |
| Orc Island - Alternate | 1984 | Adventure | |
| Orc Island - Alternate 2 | 1984 | Adventure | |
| Orc Slayer | Gamma Software | 1984 | Adventure |
| Orc Slayer - Alternate | Gamma Software | 1984 | Adventure |
| Orfeus | Proxima Software | 1990 | Utility |
| Organ Master | Currys | 1986 | Utility |
| Oriental Games | Micro Style | 1990 | Arcade |
| Oriental Hero | Firebird Software Ltd | 1987 | Arcade |
| Orion | Software Projects Ltd | 1983 | Arcade |
| Orm And Cheep - Narrow Squeaks | Macmillan Software Ltd | 1985 | Educational |
| Orpheus In The Underworld | CRL Group PLC | 1984 | Arcade |
| Ortografia 1 |
Polmer | Educational | |
| Ostron | Softek | 1983 | Arcade |
| Othello | CDS Micro Systems | Board Game | |
| Othello 2005a | Laszlo Nyitrai | 2005 | Board Game |
| Othello (ERE) | ERE Informatique | 1983 | Board Game |
| Othello (Professional Software) | Professional Software | 1983 | Board Game |
| Otodolo 2 | Laszlo Nyitrai | 2005 | Board Game |
| Outcast | CRL Group PLC | 1987 | Arcade Adventure |
| Out For The Count | Dynamite Designs | 1989 | Sports |
| Outlaw | Players Premier | 1990 | Arcade |
| Outlaw (EDOS) | EDOS | 1990 | Arcade |
| Out Of The Limelight | Zenobi Software | 1992 | Adventure |
| Out Of The Shadows | Mizar Computing | 1984 | Adventure |
| Out Of This World | Reaktor | 1987 | Arcade |
| Outrun | US Gold Ltd | 1987 | Arcade |
| Outrun Europa | US Gold Ltd | 1991 | Arcade |
| Outrun Europa (Kixx) | Kixx | 1991 | Arcade |
| Outrun (Kixx) | Kixx | 1990 | Arcade |
| Overkill | Atlantis Software Ltd | 1988 | Arcade |
| Overlander | Elite Systems Ltd | 1988 | Arcade |
| Overlander (Encore) | Encore | 1990 | Arcade |
| Overlord | CCS | 1988 | Strategy |
| Overlords | MC Lothlorien Ltd | 1985 | Strategy |
| The O Zone | Compass Software | 1986 | Adventure |
| The O Zone - Alternate | Compass Software | 1986 | Adventure |
| The O Zone Master Tape | Compass Software | 1986 | Adventure |
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