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]