Glenn Hubbard Hearn (April 17, 1914 – January 7, 1978) was an American politician who served as mayor of Huntsville, Alabama, from 1964 to 1968. He also served as a special agent for the Federal Bureau of Investigation from 1941 until becoming mayor, and as the senior agent in charge of the North Alabama division since 1944. During Hearn's term as mayor, the City of Huntsville grew in land area by approximately 40% to 106.803 square miles. However, during his term, Hearn seemed more interested in public relations than the administrative aspects of his office.