Jendrassik is a surname. Notable people with the surname include:
Ernő Jendrassik (1858–1921), Hungarian physician György Jendrassik (1898–1954), Hungarian physicist and mechanical engineer Jenő Jendrassik (1860–1919), Hungarian painter
See also Jendrassik Cs-1, was the world's first working turboprop engine Jendrassik maneuver, Medical treatment