Willian Rainey Marshall (October 17, 1825January 8, 1896) was an American politician. He was the fifth Governor of Minnesota from January 8, 1866 to January 9, 1870 and was a member of the Republican party. He served as an officer in the 7th Minnesota Volunteer Infantry Regiment during the American Civil War (1861–1865). Marshall County, Minnesota was named after him. He is listed as one of the few politicians to be an adherent of Swedenborgianism.