The Diocese of Cape Town is a diocese of the Anglican Church of Southern Africa (ACSA) which presently covers central Cape Town, some of its suburbs and the island of Tristan da Cunha, though in the past it has covered a much larger territory. The Ordinary of the diocese is Archbishop of Cape Town and ex officio Primate and Metropolitan of the ACSA. His seat is St. George's Cathedral in Cape Town.

The Anglican Church of Southern Africa, known until 2006 as the Church of the Province of Southern Africa, is the province of the Anglican Communion in the southern part of Africa. The church has twenty-five dioceses, of which twenty-one are located in South Africa, and one each in Eswatini, Lesotho, Namibia and Saint Helena. In South Africa, there are between 3 and 4 million Anglicans out of an estimated population of 45 million.