- Obliterator – Icon Design, Melbourne House 1989
- Ocean Conqueror – Rack-It 1987 – simulation
- Octan – Silverbird 1987 – shooter
- Oddi the Viking – Digital Brains 2010
- Odyssey I – Perfection Software 1983
- Off Road – Graftgold, Virgin Games 1990 – race
- Oh Mummy – Gem Software 1984 – 16k
- Omega One – J.S Computer Graphics, Mastertronic 1987
- Ometron – Simon Munnery, Software Projects 1983 – 3d
- On the Run – Design Design 1985
- One Day Cricket – Derek Baker, CRL Group 1983 – sport
- One Man and His Droid – Clive Brooker, Mastertronic 1985
- Operation Hormuz – Again Again 1989
- Operation Wolf – Ocean 1988
- Oracle’s Cave, The – Chris Dorrell, Doric Computer Services 1984
- Orb, The – CRL Group 1983
- Orbiter – Andrew Glaister, Silversoft 1982 – defender, 16k
- Orbix – John Pragnell, Streetwise 1986 – isometric
- Orc Attack – Creative Sparks 1984
- Ossuary – Cyningstan 2013 – 16k
- Othello – CDS Microsystems 1983 – board, 16k
- Out of the Shadows – Mizar Computing 1984
- Outcast – The Zen Room, CRL Group 1987
- Overlander – Elite 1988 – race
- Overlords – John Pragnell, Lothlorien 1985 – strategy
- OXO, 3D – Oasis 1983 – puzzle
- Nick Faldo Plays the Open
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