List of Irish titular sees

Prior to the Synod of Ráth Breasail the Catholic Church in Ireland did not have a diocesan system of governance. The reforming councils of the Church brought Ireland into line with the rest of the Church and established a diocesan system. Today twenty-six dioceses remain while others have been merged and still others have become extinct or used as titular sees.

Titular dioceses

 * Inis Cathaigh
 * Ceanannus Mór
 * Glendalough
 * Slebte
 * Cluain Iraird