Ardfert Cathedral ( dedicated to St Brendan, the Navigator ) is a ruined cathedral in Ardfert, near the city of Tralee, County Kerry, Munster Province, in the Republic of Ireland.
In the 6th century, St. Brendan, the Navigator founded a monastery at this site near Tralee in County Kerry. It was the seat of the Diocese of Ardfert from 1117. It is now a heritage tourism site. Ardfert Cathedral was constructed in the 11-12th century. The cathedral is decorated with some delicate Romanesque designs along the doorways, windows and choir column capitals.