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The Catholic Church in Great Britain is part of the worldwide Catholic Church, under the spiritual leadership of the Pope and curia in Rome.
The Roman Catholic Church is the world's largest Christian Church, and its largest religious grouping. There are an estimated 5 Million baptised Catholics in Great Britain.
The present hierachy was established in 1850, and specifically avoided using places that were seats of Church of England dioceses as seats. There are now four dioceses based in the same town (Birmingham, Liverpool, Portsmouth, and Southwark) — these were caused by the Church of England establishing cathedrals in cities that already had Catholic cathedrals.
Within Great Britain the hierarchy consists of:
| Province | Dioceses | Cathedral |
|---|---|---|
| Province of Birmingham | Archdiocese of Birmingham | St Chad's Cathedral |
| Diocese of Clifton | Clifton Cathedral | |
| Diocese of Shrewsbury | Shrewsbury Cathedral | |
| Province of Cardiff | Archdiocese of Cardiff | Saint David's Cathedral |
| Diocese of Menevia | Saint Joseph's Cathedral | |
| Diocese of Wrexham | Cathedral Church of Our Lady of Sorrows | |
| Province of Glasgow | Archdiocese of Glasgow | St Andrew's Cathedral |
| Diocese of Motherwell | Our Lady of Good Aid Cathedral | |
| Diocese of Paisley | St. Mirin's Cathedral | |
| Province of Liverpool | Diocese of Hallam | Cathedral Church of St Marie |
| Diocese of Hexham and Newcastle | St Mary's Cathedral | |
| Diocese of Lancaster | Lancaster Cathedral | |
| Diocese of Leeds | Leeds Cathedral | |
| Archdiocese of Liverpool | Liverpool Metropolitan Cathedral | |
| Diocese of Middlesborough | Middlesbrough Cathedral | |
| Diocese of Salford | Salford Cathedral | |
| Province of Saint Andrews and Edinburgh | Diocese of Aberdeen | St. Mary's Cathedral |
| Diocese of Argyll and the Isles | St. Columbia's Cathedral | |
| Diocese of Dunkeld | St. Andrew's Cathedral | |
| Diocese of Galloway | Good Shepherd Cathedral | |
| Archdiocese of Saint Andrews and Edinburgh | St Mary's Cathedral | |
| Province of Southwark | Diocese of Arundel and Brighton | Arundel Cathedral |
| Diocese of Plymouth | Plymouth Cathedral | |
| Diocese of Portsmouth | Cathedral of St John the Evangelist | |
| Archdiocese of Southwark | St George's Cathedral Southwark | |
| Province of Westminster | Diocese of Brentwood | Brentwood Cathedral |
| Diocese of East Anglia | Cathedral of St John the Baptist | |
| Diocese of Northampton | Northampton Cathedral | |
| Diocese of Nottingham | Nottingham Cathedral | |
| Archdiocese of Westminster | Westminster Cathedral |