| 2001068 | The ZX81 in Science Teaching | - | English |
| 2000455 | The ZX81/TS1000 Home Computer Book | - | English |
| 2000665 | The ZX81: How to Use and Program | - | English |
| 7210 | The Zacaron Mystery | ZX-Spectrum 48K | English |
| 10421 | The Zone | ZX-Spectrum 48K | English |
| 35149 | The day before the day the Earth stood still | ZX-Spectrum 48K | English |
| 5224 | Theatre Europe | ZX-Spectrum 48K | English |
| 5226 | Them | ZX-Spectrum 48K | English |
| 7090 | Theme Park U.K. | ZX-Spectrum 48K | English |
| 7091 | Theme Park U.S.A. | ZX-Spectrum 48K | English |
| 23306 | Theory of Music Questions & Exercises | ZX-Spectrum 48K/128K | English |
| 12170 | Theory of Music to Grade 5 | ZX-Spectrum 48K | English |
| 40127 | Theory of Pythagoras | ZX-Spectrum 48K | English |
| 5227 | Therbo | ZX-Spectrum 48K | English |
| 2001602 | There and Back Again: A Case History of Writing "The Hobbit" | - | English |
| 7092 | There's a Bomb Under Parliament | ZX-Spectrum 48K | English |
| 7093 | There's a Hole in Your Bucket | ZX-Spectrum 48K/128K | English |
| 34711 | Thermal Ski | ZX-Spectrum 16K | English |
| 10684 | Thermo-Nuclear War | ZX-Spectrum 48K | English |
| 7094 | Theseus and the Minotaur | ZX-Spectrum 48K | English |