János Gerendi (died after 28 August 1594) was a Transylvanian politician who supported radical theological views. He "was in contact with nearly all the prominent representatives of the radical Antitrinitarians" after 1570. His followers, who regarded Saturday as the day of rest, but did not obey all the Old Testament laws, were known as "Gerendists". He accepted atheist philosophy from the late 1580s.