Diocese of Brentwood

The diocese covers the traditional county of Essex, an area of 3,959 km² comprising the non-metropolitan County of Essex, the unitary authorities of Southend-on-Sea and Thurrock, and the London boroughs of Barking & Dagenham, Havering, Newham, Redbridge and Waltham Forest, matching Essex's historic boundaries and the Anglican Diocese of Chelmsford. The see is in the town of Brentwood where the seat is located at the Cathedral Church of Saint Mary and Saint Helen. It has 82 parishes, among these 47 parishes are in London; Havering (11), Barking and Dagenham (6), Redbridge (11), Waltham Forest (8), Newham (11).

The diocese was erected on 20 July 1917 from the Archdiocese of Westminster. The current bishop is Alan Williams, the seventh Bishop of Brentwood.

• Bernard Nicholas Ward (appointed on 20 July 1917 – died in office on 21 January 1920)
• Arthur Doubleday (appointed on 7 May 1920 – died in office on 23 January 1951)
• George Andrew Beck, A.A. (succeeded on 23 January 1951 – translated to the Diocese of Salford on 28 November 1955)
• Bernard Patrick Wall (appointed on 30 November 1955 – retired on 14 April 1969)
• Patrick Joseph Casey (appointed on 2 December 1969 – resigned on 12 December 1979)
• Thomas McMahon (appointed on 16 June 1980 – resigned on 14 April 2014)
• Alan Williams (current ordinary, appointed on 14 April 2014)

• George Andrew Beck, A.A. (1948-1951)

• Hugh Christopher Budd, appointed Bishop of Plymouth in 1985
• Brian Charles Foley, appointed Bishop of Lancaster in 1962
• John Carmel Heenan, appointed Bishop of Leeds in 1951; future Cardinal
• John Edward Petit, appointed Bishop of Menevia, Wales in 1947

• Catholic Church in England and Wales
• List of Catholic churches in the United Kingdom