The Roman Catholic Diocese of Ossory (Irish: Deoise Osraí) is a Roman Catholic diocese in eastern Ireland.
It is one of six suffragan dioceses in the ecclesiastical province of the Metropolitan Archbishop of Dublin.
The current Ordinary is the Most Reverend Dermot Farrell, who was appointed by the Holy See on 3 January 2018 and ordained bishop on 11 March 2018.

Its cathedral episcopal see is the Marian Cathedral of St. Mary of the Assumption, in Kilkenny.
The Roman Catholic Diocese of Ossory (Irish: Deoise Osraí) is a Roman Catholic diocese in eastern Ireland. It is one of six suffragan dioceses in the ecclesiastical province of the Metropolitan Archbishop of Dublin. The current Ordinary is the Most Reverend Dermot Farrell, who was appointed by the Holy See on 3 January 2018 and ordained bishop on 11 March 2018.
Its cathedral episcopal see is the Marian Cathedral of St. Mary of the Assumption, in Kilkenny.
Roman Catholic Diocese of Ossory