| Kai Karsten | |
| Birth Date: | 22 June 1968 |
| Birth Place: | Braunschweig, West Germany[1] |
| Height: | 1.88m (06.17feet) |
| Weight: | 75kg (165lb) |
| Country: |  Germany |
| Sport: | Athletics |
| Event: | 400 metres |
| Club: | LG Braunschweig |
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Kai Karsten (born 22 June 1968) is a retired German sprinter who specialized in the 400 metres.
Karsten competed for the club Eintracht Braunschweig,[2] which in athletics enters a joint team with other Braunschweig-based clubs under the name of LG Braunschweig. In 1994, he won the national championship in the 400 metres.[3]
Karsten represented Germany in the 4 × 400 metres relay events at the 1994 European Athletics Championships in Helsinki,[4] the 1995 World Championships in Athletics in Gothenburg, and the 1996 Summer Olympics in Atlanta.