Mark Maryboy (born December 10, 1955) was an 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 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 who saw to the needs of the county's residents and the Utah Navajo Element.