Hernádi is a Hungarian surname. Notable people with the surname include:
Fatima Hernadi (born 1955), Moroccan actress. Gyula Hernádi (1926–2005), Hungarian screenwriter. Judit Hernádi (born 1956), Hungarian actress. Lajos Hernádi (1906–1986), Hungarian pianist. Tibor Hernádi (1947–2012), Hungarian film director. Zsolt Hernádi (born 1960), Hungarian businessman.
See also: The Hernádi - Sanader legal process