Thomas Marion Jett (May 1, 1862 – January 10, 1939) was a U.S. Representative from Illinois.

He taught school in Bond and Montgomery Counties, Illinois.

He moved to Hillsboro, Illinois, and served as prosecuting attorney of Montgomery County 1889-1896.

He was elected as a judge of the circuit court, fourth judicial district of Illinois, in 1909.

[1] This article incorporates public domain material from the Biographical Directory of the United States Congress