• 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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