The Roman Catholic Diocese of Kilmore (Irish: Deoise na Cille Móire; Latin: Dioecesis Kilmorensis) is a Roman Catholic diocese which is mainly in the Republic of Ireland although a few parishes are in Northern Ireland. It is one of eight suffragan dioceses which are subject to the Metropolitan Archdiocese of Armagh. On 29 June 2020, it was announced that Pope Francis had appointed Martin Hayes, a former priest of the Archdiocese of Cashel and Emly, as Bishop of Kilmore in succession to Philip Leo O'Reilly. He received episcopal ordination on 20 September 2020.