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The archdiocese covers an area of 3,064 km² of the traditional counties of Monmouthshire, Herefordshire and eastern Glamorganshire (the western part forms part of the diocese of Menevia). The Metropolitan See is in the City of Cardiff where the seat is located at the Cathedral Church of Saint David .
The Catholic Diocese of Newport (formerly the Diocese of Newport and Menevia) was elevated to archdiocese status as the Archdiocese of Cardiff on 7 February 1916. The current archbishop is the Right Reverend Peter Smith , the 6th Archbishop of Cardiff.
(Any dates appearing in italics indicate de facto continuation of office. The start date of tenure below is the date of appointment or succession. Where known, the date of installation and ordination as bishop are listed in the notes together with the post held prior to appointment.)
| Tenure | Incumbent | Notes |
|---|---|---|
| 5 June 1840 to 12 April 1880 | Bishop Thomas Joseph Brown , OSB, Vicar Apostolic of the Wales District | Priest of the Order of Saint Benedict; becoming Bishop |
| 5 June 1840 to 12 April 1880 | Thomas Joseph Brown , OSB, Bishop of Newport and Menevia | Hitherto Vicar Apostolic; died in office |
| 23 March 1855Events Births January 5 King Camp Gillette, inventor († 1932) January 21 John Moses Browning, inventor († 1926) January 28 William Seward Burroughs, inventor of the calculator († 1898) March 13 Percival Lowell, astronomer († 19 to 21 March 1873Events The United Kingdom declares war against Ghana's King Kofi KariKari, who was involved in the trading of slaves. The war ended by July and the British established the Gold Coast Colony. January 17 Indian Wars: First Battle of the Stronghold during th | François Alexandre Roullet de la Bouillerie , Bishop of Cardiff | Priest of Paris; appointed Coadjutor Archbishop of Bordeaux |
| 18 February 1881 to 1895 | John Cuthbert Hedley , OSB, Bishop of Newport and Menevia | Auxiliary Bishop of Newport and Menevia; becoming Bishop of Newport |
| 1895 to 11 November 1915 | John Cuthbert Hedley , OSB, Bishop of Newport | Hitherto Bishop of Newport and Menevia; died in office |
| 7 February 1916 to 16 December 1920 | James Romanus Bilsborrow , OSB, Archbishop of Cardiff | Bishop of Port-Louis, Mauritius; resigned |
| 7 March 1921 to 25 October 1939 | Francis Edward Joseph Mostyn | Bishop of Menevia; died in office |
| 20 June 1940 to 28 February 1961 | Michael Joseph McGrath | Bishop of Menevia; died in office |
| 22 August 1961 to 25 March 1983 | John Aloysius Murphy | Bishop of Shrewsbury; retired |
| 25 March 1983 to 26 October 2001 | John Aloysius Ward , OFM Cap. | Bishop of Menevia; resigned |
| 26 October 2001 to present | Peter Smith | Bishop of East Anglia |
| Roman Catholic Hierarchy in Great Britain | ||
| England and Wales | ||
| Archdioceses | Dioceses | |
| Liverpool | Hallam | Hexham and Newcastle | Lancaster | Leeds | Middlesbrough | Salford | |
| Westminster | Brentwood | East Anglia | Northampton | Nottingham | |
| Birmingham | Clifton | Shrewsbury | |
| Cardiff | Menevia | Wrexham | |
| Southwark | Arundel & Brighton | Plymouth | Portsmouth | |
| Scotland | ||
| Glasgow | Motherwell | Paisley | |
| Saint Andrews & Edinburgh | Aberdeen | Argyll & the Isles | Dunkeld | Galloway | |
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