Theodore Dammann was a politician from the U.S. state of Wisconsin. He served as that state's twenty-third Secretary of State, serving six terms from January 3, 1927 to January 2, 1939. For his first four terms he was a Republican and served under governors Fred R. Zimmerman, Walter J. Kohler, Sr., Philip La Follette and Albert G. Schmedeman. For his second two terms he was a Progressive and served once again under Governor Philip La Follette. He resided in Milwaukee, Wisconsin at the time of his election.