Charles R. Gill (1830–1883) was a politician in the state of Wisconsin.
Gill was born in Winfield, New York, in 1830. In 1854 he moved to Watertown, Wisconsin. His son, Hiram Gill, would serve as Mayor of Seattle, Washington. He died in 1883.
From 1860 to 1861 Gill served in the Wisconsin State Senate as a Democrat. During the American Civil War, Gill served in the Union Army as a colonel, in the 29th Wisconsin Volunteer Infantry Regiment. Gill would later be elected Attorney General of Wisconsin as a Republican and hold the position from 1866 to 1870.