Dennhardt is a surname. Notable people with the surname include:
Christine Hohmann-Dennhardt (born 1950), German politician and judge Frank Dennhardt (born 1967), German tennis player Julius H. Dennhardt (1869–1929), American auctioneer, businessman and politician Oskar-Hubert Dennhardt (1915–2014), German Major in the Wehrmacht during World War II
See also Denhardt