The Diocese of Derry is a Roman Catholic diocese located in the northwest of Ireland. It covers parts of County Derry and County Tyrone and is part of the Ecclesiastical Province of Armagh. The diocese has a rich history, dating back to the early Christian period, and is known for its vibrant community and numerous parishes. The seat of the diocese is at St. Eugene's Cathedral in Derry City. The diocese is led by a bishop, who oversees the spiritual and administrative needs of the Catholic community in the region. It plays a significant role in promoting faith, education, and social justice initiatives.