Irwin St. John Tucker (January 10, 1886 – January 8, 1982) was an American priest of the Episcopal Church and a socialist activist. Born in Mobile, Alabama, he served as priest-in-charge of St. Stephen's Church. He also served as pastor for St. Mark's Church in the Bouwerie. He was an avowed socialist. In January 1915, he was jailed for one night in connection with the Haymarket Riots. He contributed to the Chicago Herald-American and served as one of the founders of the Hobo College.