Elk v. Wilkins, 112 U.S. 94 (1884), was a United States Supreme Court case. John Elk, a Winnebago Indian born on an Indian reservation and later resided among whites in the non-reservation U.S. 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.