Harder is a surname. Notable people with the surname include:
Ashley Harder
Christopher Harder
Fred Harder
Elaine Harder (1947-2013), American politician
Friedrich Harder (1891–1944), German SS-Hauptscharführer in Auschwitz concentration camp
George Harder
Hauke Harder
Hieronymus Harder (1523–1607) German botanist
James Harder
Jan Harder
Kelsie B. Harder
Mel Harder
Pat Harder
Pernille Harder (disambiguation)
Rhea Harder
Robert Harder, American politician
