The Diocese of Southwark is one of the 44 dioceses of the Church of England, part of the worldwide Anglican Communion. The diocese forms part of the Province of Canterbury in England. It was created on 1 May 1905 from part of the ancient Diocese of Rochester that was served by a Suffragan Bishop of Southwark (1891–1905). Before 1877 the area was part of the Diocese of Winchester.
The diocese covers Greater London south of the River Thames (except for the London Borough of Bexley and London Borough of Bromley) and east Surrey. Since the creation of the episcopal area scheme in 1991, the diocese is divided into three episcopal areas each of which contains two archdeaconries:
In other ecclesiastical use, although having lost religious orders in the English Reformation, the diocese has the London home of the Archbishop of Canterbury and records centre of the Church of England in the diocese, Lambeth Palace.