David William Valencia Antonio (born 29 December 1963) is a Philippine prelate of the Catholic Church who serves as the Bishop of the Diocese of Ilagan in Isabela.

David William Valencia Antonio was born in Nagtupacan, Santo Domingo, Ilocos Sur, on 29 December 1963.

[1][2] After some years as professor at the Immaculate Conception School of Theology, he was appointed dean of studies in 1993, and then rector of the same seminary.

[citation needed] In 2005, he became parish priest in Santa Lucia, Ilocos Sur, and later vicar-general of the Archdiocese of Nueva Segovia.

Co-consecrators were Ernesto Antolin Salgado, the Archbishop of Nueva Segovia, and Orlando Beltrán Quevedo, the present Cardinal-Archbishop of Cotabato.