Isaac Passy (Bulgarian: Исак Паси; 13 March 1928, Plovdiv – 13 August 2010) was a Bulgarianphilosopher specializing in aesthetics. He was a professor at Sofia University from 1952 until 1993. He was the most prolific philosopher in the history of Bulgaria. He published over 40 monographs and over 80 volumes of the philosophical classics. He was the father of Solomon Passy.