Mark Maryboy (born December 10, 1955) is a retired American politician for San Juan County, Utah, and a former Navajo Nation Council Delegate for the Utah Navajo Section of the Navajo Tribe. He is the brother of Kenneth Maryboy who currently serves as the Navejo Nation Council Delegate, in the positions he once stood. Mark is of the Navajo Indian Tribe. Mark Maryboy was also the San Juan County, Utah Commissioner for District Three. He made history when he was elected in 1986 as the first Native American county commissioner in Utah's history.