Milton Barnes (April 26, 1830 – June 2, 1895) was a Republican politician who was Ohio Secretary of State from 1877 to 1881.

[1] At the start of the American Civil War, Barnes raised a company and enlisted as captain in the Sixty-second Ohio Volunteer Infantry.

This unit participated in the first Federal invasion of the Shenandoah Valley in the spring of 1862.

In mid-1862, Milton returned home on sick leave, resigned his command, and re-enlisted in the Ninety-seventh Regiment as lieutenant colonel.

[1] In 1876 the Republican Party nominated him for Ohio Secretary of State, and he defeated William Bell Jr. in the general election.