| K | Kelvin |
| kbps | kilobits per second (10E3 bits) |
| KDP | Key Decision Point(s) |
| kg | kilogram |
| KI | K Index |
| km | kilometer |
| KMA | Korea Meteorological Administration |
| kPa | kilo Pascals |
| KPA | Key Process Area |
| KPIs | Key Performance Indicators |
| KPNR | KSC Safety Practices Procedural Requirements |
| KPP | Key Performance Parameter |
| KSC | Kennedy Space Center (NASA) |
| KTR, Ktr | Contractor |
| kVA | kilo volt ampere |