Joel Atiwag Pachao (born 29 July 1956) is a retired Filipino Episcopalian bishop.
Pachao graduated from St. Andrew's Theological Seminary in Quezon City, in 1979.
He was ordained an Episcopal deacon on 24 June 1979, and a priest on 29 July 1981.
He was elected Bishop of the Episcopal Diocese of Northern Central Philippines on 9 January 1992 and was consecrated at the Pro-Cathedral of the Resurrection in Baguio on 25 March 1992.
He was enthroned later the same year at the Cathedral of St. Mary and St. John, in Quezon City, by incumbent Prime Bishop Renato Abibico.