Thomas McLain "Mac" Middleton (born September 1, 1945) is an American politician from Maryland and a member of the Democratic Party.

After his service in the United States Army (1968–1971),[1] Middleton became the owner and operator of Cedar Hill Farm near Waldorf, Maryland.

Middleton's political career began when he was appointed to a four-year term on the Charles County Planning Commission.

"[3] In 2018, Middleton was ousted in the Gubernatorial Primary Election held on June 26, by a 651-vote margin, by community activist, and CPA, Arthur Ellis, a self-described progressive Democrat.

[4][5] In February 2008, Middleton endorsed the candidacy of Barack Obama for president of the United States.