The Roman Catholic Diocese of Tui-Vigo is one of the five Latin rite dioceses in the ecclesiastical province of the Metropolitan Archdiocese of Santiago de Compostela, which covers Galicia region in North-western Spain. Its cathedral episcopal see is Tui Cathedral, dedicated to Saint Mary, in Tui.It also has a co-cathedral, dedicated to Saint Martin and the Virgin Mary in Vigo: the Co-Cathedral of Santa María, Vigo.