Mary Ann Throne (born c. 1960) is a Democratic former member of the Wyoming House of Representatives, representing the 11th district from 2007 until 2017. In August 2017, Throne announced her candidacy for Governor of Wyoming in the 2018 election. She easily won the Democratic primary on August 21, 2018. On November 6, 2018, she was defeated in the general election by Republican State Treasurer Mark Gordon.