Dehnert is a German surname. Notable people with the surname include:

Amanda Dehnert, American theater director and professor Dutch Dehnert (1898–1979), American basketball player and coach Fred Dehnert (1928–1983), Dutch tennis player Gonca Türkeli-Dehnert (born 1975), German lawyer and government official Red Dehnert (1924–1994), American basketball player and coach