Ocean Conqueror (1987)(Rack-It)
Octagon Squad, The (1986)(Mastertronic)
Octan (1987)(Silverbird)
Odyssey I (1983)(Perfection Software)
Official Father Christmas, The (1989)(Alternative Software)
Oh Mummy (1984)(Psion)
Oink! (1987)(CRL Group)
OiX (1984)(Jaroslaw Cichocki)(Pl)
Ole Toro (1985)(Dinamic)(Sp)
Olli & Lissa II - Halloween (1987)(Firebird)
Olli & Lissa III - The Candlelight Adventure (1989)(Codemasters)
Olympic Challenge (1984)(Century City Software)
Olympicon (1984)(Microtechnica)
Olympics (1984)(Matthew Bradshaw)
Olympimania (1984)(Automata UK)
Omega Zone, The (1991)(Peter Curtis)
Ometron (1983)(Software Projects)
Omni Copy 2 (1985)(Omnisoft)
On The Bench (1988)(Cult)
On The Oche (1984)(Artic Computing)
On The Run (1985)(Design Design Software)
On The Run (1985)(Design Design Software)[a]
One For The Road (1986)(IJK Software)
One Man and His Droid (1985)(Mastertronic)
One On One (1983)(Electronic Arts)
Open Door, The (1988)(Tartan Software)
Operation Gunship (1989)(Codemasters)
Operation Hormuz (19xx)(Again Again)
Operation Wolf (1988)(Ocean Software)[t]
Oracle's Cave, The (1984)(Doric Computer Services)
