Thomas G. Lyons (May 24, 1931 – January 12, 2007) was an American politician and member of the Democratic Party active in Chicago.

Lyons joined the Chicago Police Department as a patrolman in 1953 and resigned in 1957 upon his admission to the Bar.

During his legal career, he served as Chief of the Law Division of Cook County Assessor's Office, and chief of three departments in the Office of Attorney General of Illinois, and as a partner at O'Keefe, Ashenden, O'Brien, Hanson, Lyons & Associates.

Lyons lost re-election in 1966, in part for his support for a statewide fair housing laws, similar to what would become Titles VIII through IX of the Civil Rights Act of 1968.

Howard W. Carroll, a member of the Illinois House of Representatives, defeated former State Senator Walter Duda's comeback bid.