| Sinclair ZX Spectrum cass. |  Oh Mummy | 198? | Sinclair Research, Ltd. |
| Sinclair ZX Spectrum cass. | Oink Model AS250 | 198? | Alternative Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Ole Toro | 198? | Americana Soft. |
| Sinclair ZX Spectrum cass. |  Olympic Challenge | 198? | Mind Games Espana, S.A. |
| Sinclair ZX Spectrum cass. | Olympic Spectacular | 198? | System 4 de Espana, S.A. Spain |
| Sinclair ZX Spectrum cass. | On the Oche | 198? | Paxman Promotions |
| Sinclair ZX Spectrum cass. |  On the Run | 198? | MCM Soft. Spain |
| Sinclair ZX Spectrum cass. | On the Run Model 012085 | 198? | Silverbird Soft. 012439 |
| Sinclair ZX Spectrum cass. | One On One | 198? | Serma Madrid, Spain |
| Sinclair ZX Spectrum cass. | Operation Gunship | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Operation Hormuz Model AS784 | 198? | Alternative Soft., Ltd. |
| Sinclair ZX Spectrum cass. | Operation Thunderbolt Model M1J021 | 198? | Musical 1, S.A. Spain |
| Sinclair ZX Spectrum cass. | Operation Thunderbolt Model SE 559 | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Operation Wolf | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Orbix the Terrorball | 198? | Zafiro Soft. Div. Spain |
| Sinclair ZX Spectrum cass. | Orbix the Terrorball | 198? | Bug-Byte London, England |
| Sinclair ZX Spectrum cass. | Orc Attack | 198? | Top Ten Soft. |
| Sinclair ZX Spectrum cass. | Orc Attack Model CSAC 612 | 198? | Sparklers |
| Sinclair ZX Spectrum cass. | Overlander | 198? | MCM Soft. Spain |
| Sinclair ZX Spectrum cass. | Overlander | 198? | Encore 012189 |
| Sinclair ZX Spectrum cass. | P.H.M. Pegasus | 198? | Dro Soft. Madrid, Spain |
| Sinclair ZX Spectrum cass. | Packhouse Pete | 198? | Quicksilva |
| Sinclair ZX Spectrum cass. | Panic | 198? | Krypton Force, Ltd. |
| Sinclair ZX Spectrum cass. | Panic - Monsters in Hell | 198? | Investronica Spain |
| Sinclair ZX Spectrum cass. | Paratroopers | 198? | Mr. Micro |
| Sinclair ZX Spectrum cass. | Passing Shot | 198? | Hit Squad, The UK 13156 |
| Sinclair ZX Spectrum cass. | Passing Shot | 198? | Encore 012189 |
| Sinclair ZX Spectrum cass. | Pegasus Bridge Model SUM977 | 198? | Summit Soft. |
| Sinclair ZX Spectrum cass. | Perico Delgado Maillot Amarillo | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Personal Computer Whirled! | 198? | Zenobi Soft. |
| Sinclair ZX Spectrum cass. | Peter Beardsley's International Football | 198? | Zafiro Soft. Div. Spain |
| Sinclair ZX Spectrum cass. | Peter Beardsley's International Football | 198? | Bug-Byte London, England |
| Sinclair ZX Spectrum cass. | Peter Shilton's Handball Maradona | 198? | Bug-Byte London, England |
| Sinclair ZX Spectrum cass. | Phantom Club | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Phantomas Model 2005 | 198? | Codemasters Soft. Co., Ltd., The 015026 |
| Sinclair ZX Spectrum cass. | Phonex | 198? | Rebit Computer |
| Sinclair ZX Spectrum cass. | Pi-R Squared | 198? | Bug-Byte London, England |
| Sinclair ZX Spectrum cass. | Pictionary | 198? | Hit Squad, The UK 13156 |
| Sinclair ZX Spectrum cass. | Ping Pong | 198? | Erbe Soft. Spain |
| Sinclair ZX Spectrum cass. | Planet of Death | 198? | Profisoft Germany |
