Ehrhardt is a German surname. Notable people with the surname include:
Annelie Ehrhardt (born 1950), German athlete
Helmuth Ehrhardt, German psychiatrist
Hermann Ehrhardt (1881–1971), German Freikorps commander
Arthur Ehrhardt (1896–1971), German Waffen-SS officer and leading figure in the post-war neo-Nazi movement
Clyde Ehrhardt (1921–1963), American football offensive lineman
Karl Ehrhardt (1924–2008), iconic New York Mets' fans
Rube Ehrhardt (1894–1980), American Baseball pitcher