Óscar Julio Vian Morales S.D.B. (18 October 1947 – 24 February 2018) was a Guatemalan archbishop of the Roman Catholic Archdiocese of Guatemala from his appointment by Pope Benedict XVI on 2 October 2010 until his death in 2018. He had served as archbishop of Los Altos in Guatemala. He was born in Guatemala City. He was installed as Archbishop of Los Altos on 17 April 2007.