Thomas Michael Hagedorn (born November 27, 1943) is an American politician who served in the United States House of Representatives as a Republican from Minnesota.

After returning to Minnesota, he engaged in grain and livestock farming in Watonwan County.

He served as a member of the Minnesota House of Representatives from 1971 to 1975 and was a delegate to the Minnesota State and County Republican conventions in 1968 and 1972, and the national Republican conventions in 1976 and 1980.

He was an unsuccessful candidate for reelection to represent Minnesota's 1st congressional district in the 98th congress in 1982.

Hagedorn was succeeded in the House by author, businessman, and musician Tim Penny.