Roman Catholic Diocese of Argyll and the Isles
Diocese of Argyll and the Isles Dioecesis Ergadiensis et Insularum  | |
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| Location | |
| Country | Scotland | 
| Territory | Most of Argyll and Bute, southern part of Highland, and Outer Hebrides, plus the Isle of Arran | 
| Ecclesiastical province | St Andrews and Edinburgh | 
| Metropolitan | St Andrews and Edinburgh | 
| Statistics | |
| Area | 31,080 km2 (12,000 sq mi) | 
Population
 
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| Parishes | 25 | 
| Information | |
| Denomination | Roman Catholic | 
| Rite | Latin Rite | 
| Established | 4 March 1878 | 
| Cathedral | St Columba's Cathedral, Oban | 
| Secular priests | 29 | 
| Current leadership | |
| Pope | Leo XIV | 
| Bishop | Brian McGee | 
| Metropolitan Archbishop | Leo Cushley | 
| Episcopal Vicars | 
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| Website | |
| www.rcdai.org.uk | |
The Diocese of Argyll and the Isles (Latin: Diocesis Ergadiensis et Insularum) is a Latin Church ecclesiastical territory or diocese of the Catholic Church in Scotland, in the Province of Saint Andrews and Edinburgh.