| Game Name | System |
|---|
| North and South (1989)(Infogrames)(M5) | Atari ST |
| Norwood Castle (1989)(Motelsoft)(PD) | Atari ST |
| Not a Penny more Not a Penny less (1987)(Domark)[a][one disk] | Atari ST |
| Not a Penny more Not a Penny less (1987)(Domark)[one disk] | Atari ST |
| Notator v1.01 (1988)(Adam - Lengeling)[cr MCA] | Atari ST |
| Notator v1.01 (1988)(Adam - Lengeling)[cr MCA][a] | Atari ST |
| Notator v3.0 (1991)(Adam - Lengeling)[cr MCA] | Atari ST |
| Notator v3.0 (1991)(Adam - Lengeling)[cr MCA][a2] | Atari ST |
| Notator v3.0 (1991)(Adam - Lengeling)[cr MCA][a] | Atari ST |
| Numeroscope v1.2 (1988)(Prymac, Jean-Claude)(fr)(PD) | Atari ST |
| Numeyoga v1.1 (1993-08-28)(Pochat, Wilfried)(FW) | Atari ST |
| OMEn v2.46d (demo) (19xx)(Esquimalt Digital Logic Inc.)[Demo Time expired] | Atari ST |
| OVR Compil Code (19xx)(OVR) | Atari ST |
| Obitus (1991)(Psygnosis)(Disk 1 of 2)[cr ICS][m EMT][t][b] | Atari ST |
| Obitus (1991)(Psygnosis)(Disk 1 of 3)[cr Elite] | Atari ST |
| Obitus (1991)(Psygnosis)(Disk 2 of 2)[cr ICS][m EMT][t][b] | Atari ST |
| Obitus (1991)(Psygnosis)(Disk 2 of 3)[cr Elite] | Atari ST |
| Obitus (1991)(Psygnosis)(Disk 3 of 3)[cr Elite] | Atari ST |
| Obliterator (1988)(Psygnosis)(Disk 1 of 2) | Atari ST |
| Obliterator (1988)(Psygnosis)(Disk 2 of 2) | Atari ST |
| Obliterator (1988)(Psygnosis)[cr Was -Not Was-][one disk] | Atari ST |
| Obsession (1994)(Unique Development Sweden)(Disk 1 of 2) | Atari ST |
| Obsession (1994)(Unique Development Sweden)(Disk 1 of 2)[cr Euroswap] | Atari ST |
| Obsession (1994)(Unique Development Sweden)(Disk 1 of 2)[cr Vectronix] | Atari ST |
| Obsession (1994)(Unique Development Sweden)(Disk 1 of 2)[cr Vectronix][a] | Atari ST |
| Obsession (1994)(Unique Development Sweden)(Disk 2 of 2) | Atari ST |
| Obsession (1994)(Unique Development Sweden)(Disk 2 of 2)[cr Euroswap] | Atari ST |
| Obsession (1994)(Unique Development Sweden)(Disk 2 of 2)[cr Vectronix] | Atari ST |
| Obsession (1994)(Unique Development Sweden)(Disk 2 of 2)[cr Vectronix][a] | Atari ST |
| Ocean Beach Volley (1989)(Ocean)(Disk 1 of 2) | Atari ST |
| Ocean Beach Volley (1989)(Ocean)(Disk 1 of 2)[a] | Atari ST |
| Ocean Beach Volley (1989)(Ocean)(Disk 2 of 2) | Atari ST |
| Ocean Beach Volley (1989)(Ocean)(Disk 2 of 2)[a] | Atari ST |
| Ocean Beach Volley (1989)(Ocean)[cr MCA][splitted Version] | Atari ST |
| Ocean Beach Volley (1989)(Ocean)[cr Manolo le Gitan][t] | Atari ST |
| Ocean Beach Volley (1989)(Ocean)[cr Manolo le Gitan][t][a] | Atari ST |
| Octalyser, The (19xx)(Alan F. Blade)(SW) | Atari ST |
| Oekopoly v1.0D (1991)(SBU Muenchen)(de)[cr Elite] | Atari ST |
| Ogre (19xx)(Jenkin, Michael)(PD) | Atari ST |
| Ogre v1.06 (1986)(Origin Systems)[cr Elite][b] | Atari ST |
| Oh Craps! (19xx)(-) | Atari ST |
| Oh-no ! More Lemmings (1991)(Psygnosis) | Atari ST |
| Oh-no ! More Lemmings (1991)(Psygnosis)[a2] | Atari ST |
| Oh-no ! More Lemmings (1991)(Psygnosis)[a] | Atari ST |
| Oh-no ! More Lemmings (1991)(Psygnosis)[cr Elite][t] | Atari ST |
| Oh-no ! More Lemmings (1991)(Psygnosis)[cr Vmax][t +2] | Atari ST |
| Oh-no ! More Lemmings (1991)(Psygnosis)[t] | Atari ST |
| Oids (1987)(FTL) | Atari ST |
| Oids (1987)(FTL)[cr Was -Not Was-] | Atari ST |
| Oids (1987)(FTL)[t +4 Pugsy] | Atari ST |
| Oil Imperium (1989)(ReLINE Software)(Disk 1 of 2)[b] | Atari ST |
| Oil Imperium (1989)(ReLINE Software)(Disk 2 of 2)[b] | Atari ST |
| Oilmania (1991)(Buetepage, Michael) | Atari ST |
| Oliver and Company (1989)(Coktel Vision)(M5)[cr Empire] | Atari ST |
| Omar Sharif's Bridge (1992)(Oxford Softworks)[b] | Atari ST |
| Omar Sharif's Bridge (1992)(Oxford Softworks)[cr Elite] | Atari ST |
| Omega (1989)(Origin) | Atari ST |
| Omikron Basic v2.2 (19xx)(Omikron) | Atari ST |
| Omikron Basic v3.0 (1988)(Omikron)[!] | Atari ST |
| Omikron Basic v3.0 (19xx)(Omikron) | Atari ST |
| Omikron Basic v3.01 (1988)(Omikron) | Atari ST |
| Omikron Basic v3.01 (1988)(Omikron)[a] | Atari ST |
| Omikron Basic v3.03 (19xx)(Omikron) | Atari ST |
| Omnicron Conspiracy (1990)(Image Works) | Atari ST |
| On the Road (1990)(Lifetimes)(Disk 1 of 2) | Atari ST |
| On the Road (1990)(Lifetimes)(Disk 2 of 2) | Atari ST |
| On the Road (1990)(Lifetimes)(de)(Disk 1 of 2) | Atari ST |
| On the Road (1990)(Lifetimes)(de)(Disk 2 of 2) | Atari ST |
| Once a King v2 (1988-03-24)(Lavery, Darryn - Griffiths, Mark)(FW) | Atari ST |
| One Day Cricket (19xx)(Paladin)(PD) | Atari ST |
| Online Backgammon (1991)(Becker, David)(FW)[Monochrome] | Atari ST |
| Only! Valency (1994-12-06)(Schulz, Jens)(de)(SW) | Atari ST |
| Onslaught (1989)(Realms) | Atari ST |
| Onslaught (1989)(Realms)[cr Equinox][t] | Atari ST |
| Onslaught (1989)(Realms)[cr Equinox][t][a] | Atari ST |
| Onslaught (1989)(Realms)[cr Quant] | Atari ST |
| Oo-Topos (1986)(Softkill Int.) | Atari ST |
| Ooze (1988)(Dragonware Games)(de)[cr Bladerunners][m EMT] | Atari ST |
| Ooze v1.2E (1988)(Dragonware Games) | Atari ST |
| Ooze v1.2E (1988)(Dragonware Games)[a] | Atari ST |
| Operation Ble Sunrise v3.00 (1992-09)(Creative Insanity)(SW) | Atari ST |
| Operation Garfield (1992)(Brankin, D.J.)(PD) | Atari ST |
| Operation Garfield (1992)(Brankin, D.J.)(PD)[a] | Atari ST |
| Operation Harrier (1990)(U.S. Gold)[cr Empire][b] | Atari ST |
| Operation Jupiter (1988)(Infogrames)(fr)[b2] | Atari ST |
| Operation Jupiter (1988)(Infogrames)(fr)[b] | Atari ST |
| Operation Jupiter (1988)(Infogrames)(fr)[cr Bladerunners] | Atari ST |
| Operation Jupiter (1988)(Infogrames)(fr)[cr Bladerunners][a] | Atari ST |
| Operation Jupiter (1988)(Infogrames)(fr)[cr Bladerunners][m Rain Man] | Atari ST |
| Operation Jupiter (1988)(Infogrames)(fr)[cr Przemek Wysocki] | Atari ST |
| Operation Jupiter (1988)(Infogrames)(fr)[tr en-de partial] | Atari ST |
| Operation Neptune (1989)(Infogrames)(Disk 1 of 2)[!] | Atari ST |
| Operation Neptune (1989)(Infogrames)(Disk 2 of 2)[!] | Atari ST |
| Operation Stealth (1990)(U.S. Gold)(Disk 1 of 3)[cr Medway Boys] | Atari ST |
| Operation Stealth (1990)(U.S. Gold)(Disk 2 of 3)[cr Medway Boys] | Atari ST |
| Operation Stealth (1990)(U.S. Gold)(Disk 3 of 3)[cr Medway Boys] | Atari ST |
| Operation Stealth (1990)(U.S. Gold)(fr)(Disk 1 of 3)[a][protected] | Atari ST |
| Operation Stealth (1990)(U.S. Gold)(fr)(Disk 1 of 3)[cr Empire] | Atari ST |
| Operation Stealth (1990)(U.S. Gold)(fr)(Disk 1 of 3)[cr Replicants] | Atari ST |
| Operation Stealth (1990)(U.S. Gold)(fr)(Disk 1 of 3)[cr] | Atari ST |
