The Diocese of Derry (Latin: Dioecesis Derriena; Irish: Deoise Dhoire) is a Latin Church diocese of the Catholic Church which straddles the international frontier between the Republic of Ireland and Northern Ireland.

As part of their adult faith development, the diocese runs the Diploma in Pastoral Theology validated by St. Patrick's College, Maynooth,[2] from the Drumalis Retreat Centre.

[3] The Derry Diocese Catechetical Centre in conjunction with St Mary's University, Twickenham offer a Masters in Catholic School Leadership.

As well as the city of Derry, the main towns are Buncrana, Coleraine, Lifford, Limavady, Maghera, Omagh and Strabane.

The following is a basic list of the post-Reformation Roman Catholic bishops and vicars apostolic.