Zahn Tokiya-ku McClarnon is an American actor known for his performances in the Western crime drama series Longmire, the second season of Fargo, and the second season of Westworld. In 2022 he plays the lead role in the AMC series Dark Winds. He also features in the 2021 FX on Hulu series Reservation Dogs, and the Marvel Cinematic Universe series Hawkeye (2021), and Echo (2023).

McClarnon was born in Denver, Colorado, the son of a Hunkpapa Lakota mother and a father of Irish ancestry. He grew up near Browning, Montana, where his father worked at Glacier National Park for the National Park Service. He would often visit the Blackfeet Indian Reservation, where his mother grew up, and often stayed with his maternal grandparents on weekends and for longer visits. His mother lived on the Rosebud Indian Reservation in South Dakota. When his father was relocated to Omaha, Nebraska, for work, the family lived in the Joslyn Castle and Dundee neighborhoods. McClarnon has a fraternal twin brother.