Hellmann is a German surname. Notable people with the surname include:
Claudia Hellmann (born 1932?), German contralto
Diethard Hellmann (1928–1999), German choral conductor and academic
Gustav Hellmann (1854–1939), German meteorologist
Hans Hellmann (1903–1938), German theoretical chemist
Hellmann–Feynman theorem
Martina Hellmann (born 1960), German athlete
William K. Hellmann, former Secretary of the Maryland Department of Transportation