The Roman Catholic Diocese of Raphoe is a diocese located in the northwest of Ireland. It is part of the ecclesiastical province of Armagh and covers counties Donegal and parts of Derry. The diocese was established in the 6th century and has a rich history, with its seat at St. Eunan's Cathedral in Letterkenny. The diocese is responsible for the spiritual and administrative needs of its parishes and communities. It is led by a bishop, who oversees the clergy and promotes the teachings of the Roman Catholic Church. The diocese also engages in various educational and charitable activities to support its local population.