James Gilliland Simpson^[1] (16 October 1865 – 10 October 1948^[2]) was the Dean of Peterborough in the Church of England from 1928 to 1942.^[3]

He was educated at the City of London School and Trinity College, Oxford,^[4] he was ordained in 1889 and began his career with a curacy at Leeds Parish Church.^[5] He was then appointed Vice Principal of Edinburgh Theological College^[6] after which he was Principal of Leeds Clergy School^[7] before becoming Canon of Manchester in 1910.^[8] Two years later he became a Canon of St Paul's, a post he held for seventeen years before his elevation to the Deanery.^[9] He was a noted author.^[10][11]