William Vance Rinehart (28 December 1835 – 16 October 1918) was an American soldier who served as a Union Army officer in both the 1st Oregon Volunteer Cavalry Regiment and 1st Oregon Volunteer Infantry Regiment during the American Civil War.
He was later appointed as Indian agent at the Malheur Indian Reservation in eastern Oregon.
Rinehart then moved to Seattle, Washington where he engaged in business and was active in state and local politics.
He was elected to Washington state's first legislature, serving as a state senator from 1889 through 1890.