Roman Catholic Diocese of Ardagh and Clonmacnoise
| Diocese of Ardagh and Clonmacnoise Dioecesis Ardachadensis et Cluanensis Deoise Ardach agus Chluain Mhic Nóis | |
|---|---|
| Location | |
| Country | Ireland | 
| Territory | Most of counties Longford and Leitrim and parts of counties Cavan, Offaly, Roscommon, Sligo and Westmeath | 
| Ecclesiastical province | Province of Armagh | 
| Metropolitan | Archdiocese of Armagh | 
| Statistics | |
| Area | 940 sq mi (2,400 km2) | 
| Population 
 
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| Information | |
| Denomination | Catholic | 
| Rite | Roman Rite | 
| Established | 1756 | 
| Cathedral | St. Mel's Cathedral, Longford | 
| Patron saint | St Mel | 
| Current leadership | |
| Pope | Leo XIV | 
| Bishop | Paul Connell, Bishop of Ardagh and Clonmacnoise | 
| Metropolitan Archbishop | Eamon Martin | 
| Vicar General | Monsignor Patrick Early | 
| Bishops emeritus | Colm O'Reilly | 
| Map | |
| Website | |
| ardaghdiocese.org | |
The Diocese of Ardagh and Clonmacnoise (Latin: Dioecesis Ardachadensis et Cluanensis; Irish: Deoise Ardach agus Chluain Mhic Nóis) is a Latin Church diocese of the Catholic Church in Ireland.