The Cathedral Church of St. Fachtna, Ross, is a cathedral of the Church of Ireland in Rosscarbery, County Cork in Ireland. It is in the ecclesiastical province of Dublin.
Previously the cathedral of the Diocese of Ross, it is now one of three cathedrals in the United Dioceses of Cork, Cloyne and Ross. Dating from the 1600s, it was extensively refurbished in the 19th century.
St Fachtna's is one of the smallest cathedrals in Ireland. It is the size of a typical parish church.Fachtna of Rosscarbery came to the area in the sixth century; his monastery, a cruciform building, was replaced by the cathedral. This had been the principal monastery of West Cork; Brendan the Navigator taught there, and it was a school for international students in its time.The church is famous for its Irish Wolfhound mascot.The Cathedral contains a fine set of six bells in the key of G, which are regularly rung.