Huntington was born in Lowell, Mass. 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. Dr. Huntington always took a prominent part in public affairs. He was active in the movement for liturgical revisions and was long chairman of the Prayer-Book Revisions Committee, and editor with Dr. Samuel Hart of the Standard Prayer-Book of 1892.
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," ie., 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:
- The Holy Scriptures, as containing all things necessary to salvation;
- The Creeds (specifically, the Apostles' and Nicene Creeds), as the sufficient statement of Christian faith;
- The dominical sacraments of Baptism and Holy Communion;
- The historic episcopate, locally adapted.
The Quadrilateral has had a significant impact on Anglican identity since its passage by the Lambeth Conference. The Resolution came at a time of rapid expansion of the Anglican Communion, primarily in the territories of the British Empire. As such, it provided a basis for a shared ethos, one that became increasingly important as colonial churches influenced by British culture and values, evolved into national ones influenced by local norms.
Huntington also wrote:
- Conditional Immortality (1878)
- The Book Annexed: Its Critics and its Prospects (1886)
- Short History of the Book of Common Prayer (1893)
- A National Church (1898)
- Sonnets and a Dream (1904)
- A Good Shepherd and Other Sermons (1906)
- Documents by William Reed Huntington from Project Canterbury