The archbishop of Canterbury is the senior bishop and a principal leader of the Church of England, the ceremonial head of the worldwide Anglican Communion and the diocesan bishop of the Diocese of Canterbury. The current archbishop is Justin Welby, who was enthroned at Canterbury Cathedral on 21 March 2013. Welby is the 105th in a line which goes back more than 1400 years to Augustine of Canterbury, the "Apostle to the English", sent from Rome in the year 597. Welby succeeded Rowan Williams.

From the time of Augustine until the 16th century, the archbishops of Canterbury were in full communion with the See of Rome and usually received the pallium from the pope. During the English Reformation, the Church of England broke away from the authority of the pope. Thomas Cranmer became the first holder of the office following the English Reformation in 1533, while Reginald Pole was the last Roman Catholic in the position, serving from 1556 to 1558 during the Counter-Reformation. In the Middle Ages there was considerable variation in the methods of nomination of the archbishop of Canterbury and other bishops. At various times the choice was made by the monks of the cathedral priory (before the Dissolution of the Monasteries under Henry VIII) the pope, or the king of England. Since the English Reformation, the Church of England has been more explicitly a state church and the choice is legally that of the Crown; today it is made by the reigning monarch on the advice of the prime minister, who in turn receives a shortlist of two names from an ad hoc committee called the Crown Nominations Commission.