Mehnert is a surname. Notable people with the surname include:
Björn Mehnert (born 1976), German football player George Mehnert (1881–1948), American wrestler Katie Mehnert (born 1975), American businesswoman Klaus Mehnert (1906–1984), German political scientist and journalist Marcus Mehnert (born 1997), Norwegian football player Siegfried Mehnert (born 1963), German boxer