William Reed Huntington (September 20, 1838 – July 26, 1909) was an American Episcopal priest and author.
Huntington was born in Lowell, Massachusetts. He graduated at Harvard in 1859 and in 1859–1860 was an instructor in chemistry there. Entering the Episcopal ministry, he was rector of All Saints Church, Worcester, Massachusetts, in 1862–1883 and of Grace Church, New York from 1883 until his death. Huntington always took a prominent part in public affairs. He was active in the movement for liturgical revisions and was secretary of the Prayer-Book Revisions Committee, and editor with Samuel Hart of the Standard Prayer-Book of 1892. Huntington died in Nahant, Massachusetts, in 1909. Huntington was elected a member of the American Antiquarian Society in 1875.
The Chicago-Lambeth Quadrilateral had its genesis in an 1870 essay by Huntington. In The Church Idea, an Essay toward Unity Huntington's goal was to establish "a basis on which approach may be by God's blessing, made toward Home Reunion," i.e., with the Roman Catholic and Orthodox Churches. The Quadrilateral is a four-point articulation of Anglican identity, often cited as encapsulating the fundamentals of the Communion's doctrine and as a reference-point for ecumenical discussion with other Christian denominations. The four points are: