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.

In 1863, the Diocese of Bloemfontein was created, taking over all the territory north of the Orange River and the Drakensberg mountains.

In their original form, the arms were : Quarterly Azure and Sable: I and IV, a lion rampant Argent; II and IV, three open crowns palewise Or; on a cross throughout Or an anchor in fess point Sable and in honour point the shield of arms of Baroness Burdett-Coutts; the shield ensigned with a Bishop's mitre proper.

The revision consisted of replacing the Burdett-Coutts shield with a stag's head erased Gules, between the attires a pheon Azure.