| K | Coefficient of coupling |
| k | Kilo (10^3) |
| KB | Kilo Bytes |
| KDC | Kodak Digital Camera image format |
| KDLOC | 1000 Developed source Lines Of Code |
| KGB | Known Good Board |
| KGD | Known Good Die |
| KGU | Known Good Unit |
| KIT | Key Intelligence Topics; Kingston Interactive Television |
| KPA | Key-Process Area |
| KSLOC | 1000 source lines of code |
| KTS | Key Telephone System |
| Ka-band | 20-30 GHz (broadband) |
| keV | Kilo Electron Volt |
| kHz | Kilohertz |
| Ku-band | Satellite to Satellite communication frequency (109-17 GHz) |
| kV | Kilovolt |
| kVA | Kilovoltampere |
| kW | Kilowatt |
| kWh | Kilowatt-hour |
