Thomas J. Courtney (December 23, 1892 – December 3, 1971) was an influential Illinois Democratic politician and attorney for roughly 50 years in the mid-20th Century. Courtney was born in Chicago, Illinois to James R. Courtney and Catherine (Hussey) Courtney. In 1917 he married Kathryn Foley. In 1927 he was elected to the Illinois State Senate from the 11th District, serving one term of six years. While State's Attorney Courtney was twice a delegate to the Democratic National Convention.