The Archbishop of Cashel was an archiepiscopal title which took its name after the town of Cashel, County Tipperary in Ireland. Following the Reformation, there had been parallel apostolic successions to the title: one in the Catholic Church and the other in the Church of Ireland. The archbishop of each denomination also held the title of Bishop of Emly. In the Catholic Church, it was superseded by the role of Archbishop of Cashel and Emly when the two dioceses were united in 2015 and in the Church of Ireland the title was downgraded to a bishopric in 1838.

The Cathedral of the Assumption is the mother church of the Metropolitan Province of Cashel and the cathedral church of the Roman Catholic Archdiocese of Cashel and Emly in Thurles, County Tipperary in Ireland. It is the cathedra of the Archbishop of Cashel and Emly and stands on the site of earlier chapels, which were the only Roman Catholic churches in Thurles. Following the English Reformation, many archdiocesan assets, including the cathedral at the Rock of Cashel were appropriated by the established church. James Butler II (1774–91), on being appointed by the Holy See, moved his residence and cathedra from Cashel, favouring Thurles instead, where his successors continue to reign today.