Harry Mordecai Winitsky (1898–1939) was an American left wing political activist who was a founding member of the Communist Party of America. Winitsky is best remembered as one of the chief defendants of the New York prosecutions that were part of the First Red Scare of 1919–1920. Winitsky served two years in prison of a 5 to 10-year sentence beginning in March 1920. Released on bail in 1922, Winitsky was ultimately pardoned by New York Governor Al Smith in January 1924. Winitsky left the Communist Party USA in 1929.