Thomas Mark Barrett (born December 8, 1953) is an American politician and member of the Democratic Party who has served as the 44th Mayor of Milwaukee, Wisconsin since 2004.
He served in the United States House of Representatives from 1993 to 2003, and the Wisconsin State Senate from 1989 to 1993.
He previously served in the Wisconsin State Assembly from 1984 until 1989.
Barrett ran for Governor of Wisconsin in 2010, losing in the general election to Republican Scott Walker.
After a recall election, Barrett again ran for governor in 2012 and was defeated by Walker.