Mary Arp (4 July 1885 — 18 January 1998) was a verified American supercentenarian who was one of the oldest people in Minnesota at the time of her death. Mary was born in Iowa on 4 July 1885. Her parents were Henry Arp and Elizabeth Arp. They moved to Minnesota before 1895. She never married. She died in Luverne, Rock, Minnesota, USA on 18 January 1998 at the age of 112 years, 198 days. Her age was verified by the Kestenbaum study.