The Comptroller of Illinois is a constitutional officer in the executive branch of government of the U.S. state of Illinois. Ten individuals have held the office of Comptroller since the enactment of the Illinois Constitution of 1970, replacing the prior office of Auditor of Public Accounts that was first created in 1799. The incumbent is Susana Mendoza, a Democrat.

Susana A. Mendoza is an American politician. She is the 10th comptroller of Illinois, serving since December 2016. A member of the Democratic Party, she formerly served as Chicago city clerk and as an Illinois State Representative, representing the 1st District of Illinois.