Ehrhardt is a German surname. Notable people with the surname include:
Annelie Ehrhardt (born 1950), German athleteHelmuth Ehrhardt, German psychiatristHermann Ehrhardt (1881–1971), German Freikorps commanderArthur Ehrhardt (1896–1971), German Waffen-SS officer and leading figure in the post-war neo-Nazi movementClyde Ehrhardt (1921–1963), American football offensive linemanKarl Ehrhardt (1924–2008), iconic New York Mets' fansRube Ehrhardt (1894–1980), American Baseball pitcher