Elk v. Wilkins, 112 U.S. 94 (1884), was a United States Supreme Court landmark decision respecting the citizenship status of Indians. John Elk, a Winnebago Indian, was born on an Indian reservation and later resided with whites on the non-reservation US territory in Omaha, Nebraska, where he renounced his former tribal allegiance and claimed citizenship by virtue of the Citizenship Clause. The case came about after Elk tried to register to vote on April 5, 1880 and was denied by Charles Wilkins, the named defendant, who was registrar of voters of the Fifth ward of the City of Omaha.