Klaus Bonsack (26 December 1941 – 5 March 2023), also known as Klaus-Michael Bonsack, was an East Germanluger who competed during the 1960s and early 1970s.
Bonsack was born in Waltershausen, Thuringia on 26 December 1941. He won four Winter Olympic medals in men's luge, including one gold (doubles: 1968), one silver (singles: 1964), and two bronzes (singles: 1968, doubles: 1972).
Bonsack also won five medals at the FIL World Luge Championships, including one gold (doubles: 1967), two silvers (doubles: 1965, singles: 1967), and two bronzes (singles: 1963, doubles: 1969).