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)
Orbiter (1982)(Silversoft)
Orbix The Terrorball (1986)(Domark)
Orc Attack (1984)(Creative Sparks)
Orient Gardens (19xx)(-)(It)
Orient Gardens (19xx)(-)(It)[a]
Orion (1983)(Software Projects)
Othello (19xx)(-)(De)
Othello (1983)(CDS Micro Systems)
Out Cast (1987)(CRL Group)
Out For The Count (1989)(Dynamite Designs)
Out Of The Shadows (1984)(Mizar Computing)
Out Of This World (1987)(Ariolasoft)
Outlet - The Spectrum Drive Magazine! No.78 (1994)(Chezron Software)
Outrun (1987)(US Gold)
Outrun (1987)(US Gold)[a]
Outrun Europa (1991)(US Gold)
Overlords (1985)(M.C. Lothlorien)
P-47 - The Freedom Fighter (1990)(Firebird)[t]
Painter (19xx)(A & F Software)
Painter (19xx)(A & F Software)[a]
Pakacuda (1983)(Rabbit Software)
Pang (1990)(Ocean Software)(128k)
