John Gibson McMynn (July 9, 1824-June 5, 1900) was an American educator.
Born in Palatine Bridge, New York, McMynn graduated from Williams College in 1848. In 1848, he moved to Kenosha, Wisconsin, where he started a school. Eventually, he moved to Racine, Wisconsin to set up the public school system. In 1861, he moved to Winona, Minnesota to help set up the first normal school in Minnesota now Winona State University. However, when the American Civil War started he went back to Wisconsin and joined the 10th Wisconsin Volunteer Infantry Regiment and was commssioned a colonel. He served as Superintendent of Public Instruction of Wisconsin 1864-1868. McMynn helped set up the Wisconsin Teachers Association and served as regent for the University of Wisconsin. He also worked for Jerome Case.[1][2]