| width="25%"|Tenure | width="40%"|Incumbent | width="20%"|Notes |
| small>5 June 1840 to 12 April 1880 | Bishop Thomas Joseph Brown, OSB, Vicar Apostolic of the Wales District | Priest of theOrder of Saint Benedict; becoming Bishop |
| small>5 June 1840 to 12 April 1880 | Thomas Joseph Brown, OSB, Bishop of Newport and Menevia | Hitherto Vicar Apostolic; died in office |
| small>23 March 1855 to 21 March 1873 | Franois Alexandre Roullet de la Bouillerie, Bishop of Cardiff | Priest of Paris; appointed Coadjutor Archbishop of Bordeaux |
| small>18 February 1881 to 1895 | John Cuthbert Hedley, OSB, Bishop of Newport and Menevia | Auxiliary Bishop of Newport and Menevia; becoming Bishop of Newport |
| small>1895 to 11 November 1915 | John Cuthbert Hedley, OSB, Bishop of Newport | Hitherto Bishop of Newport and Menevia; died in office |
| small>7 February 1916 to 16 December 1920 | James Romanus Bilsborrow, OSB, Archbishop of Cardiff | Bishop of Port-Louis, Mauritius; resigned |
| small>7 March 1921 to 25 October 1939 | Francis Edward Joseph Mostyn | Bishop of Menevia; died in office |
| small>20 June 1940 to 28 February 1961 | Michael Joseph McGrath | Bishop of Menevia; died in office |
| small>22 August 1961 to 25 March 1983 | John Aloysius Murphy | Bishop of Shrewsbury; retired |
| small>25 March 1983 to 26 October 2001 | John Aloysius Ward, OFM Cap. | Bishop of Menevia; resigned |
| small>26 October 2001 to present | Peter Smith | Bishop of East Anglia |