The Diocese of East Anglia (Latin: Dioecesis Angliae Orientalis) is a Latin diocese of the Catholic Church covering the counties of Cambridgeshire, Norfolk, Suffolk, and Peterborough in eastern England.

Masses are also said at RAF Lakenheath, at Clare Priory, at the Monastery of Our Lady of Mount Carmel in Quidenham, at the care home of the Sisters of Our Lady of Grace and Compassion in Great Barton, and in the villages of Cavendish and Woolpit.

[3] Masses are also said at RAF Alconbury, at Blackfriars, the Dominican Priory of St Michael, Cambridge, at Fisher House University Chaplaincy, and in the villages of Bar Hill and Papworth Everard.

On 13 March 1976; 48 years ago (1976-03-13), by the decree Quod Ecumenicum, Pope Paul VI formed the Diocese of East Anglia (from the counties of Cambridge, Norfolk and Suffolk) out of the Diocese of Northampton.

Bishop Clark had previously been auxiliary bishop of Northampton and co-chairman of ARCIC (Anglican/Roman Catholic International Commission), with the cathedral being established at the former parish church of St John the Baptist, Norwich.