St Mary's Church, Battersea, is the oldest of the churches in Battersea in the London Borough of Wandsworth, in the inner south-west of the UK's capital city. Its parish shared by three Anglican churches is in the diocese of Southwark. Christians have worshipped at the site continuously since around 800 AD. It is a Grade I listed building for its combined heritage and architectural merit.

The Diocese of Southwark is one of the 42 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 most of the area was part of the Diocese of Winchester, some being part of the Diocese of London.