William Hagger Barlow (1833–1908) was the Dean of Peterborough in the Church of England from 1901 until his death in 1908.^[1]

William Hagger Barlow was born in 1833,^[2] son of Henry Hagger, Vicar of Pitsmoor,^[3] and educated at St John's College, Cambridge.^[4] Ordained in 1858,^[5] he began his career with a curacy at St James Bristol^[6] before being appointed Vicar of St Bartholomew Montpelier.^[7] After serving as Vicar of St. Ebbe's, Oxford,^[8] from 1875 he was Principal of the Church Missionary Society College, Islington^[9] and was later Vicar of St Mary's Islington.^[10] He was elevated to the Deanery in June 1901,^[11][12] and installed in Peterborough Cathedral 5 October 1901, preaching there for the first time the following morning^[13]