| 29016 | Knikkers | ZX81 16K | Dutch |
| 21660 | Knocker Blocker | ZX-Spectrum 48K | English |
| 39621 | Knockout | ZX-Spectrum 48K | English |
| 2726 | Knockout | ZX-Spectrum 48K | English |
| 40487 | Knockout | ZX-Spectrum 16K | English |
| 40578 | Knockout Fred and the Circlemen | ZX81 16K | English |
| 29017 | Knoop | ZX81 16K | Dutch |
| 31058 | Knot in 2D | ZX-Spectrum 16K | English |
| 31111 | Knot in 2D (Machine Code Edition) | ZX-Spectrum 48K | English |
| 2729 | Knot in 3D | ZX-Spectrum 48K | English |
| 41229 | Knots | ZX81 1K | English |
| 23997 | Koko Circus | ZX-Spectrum 48K | Spanish |
| 12902 | Kolobok Zoom 2: In The Unfair World | ZX-Spectrum 128K | English |
| 12901 | Kolobok Zoom: Teenage Mutant Hero | ZX-Spectrum 128K | English |
| 12903 | Kombatris | ZX-Spectrum 128K | Russian |
| 33424 | Kong | ZX80 | - |
| 33425 | Kong | ZX81 16K | - |
| 41449 | Kong Jump | ZX81 16K | English |
| 40952 | Kong Leap | ZX81 16K | English |
| 9886 | Kongman | ZX-Spectrum 48K | German |