Ardfert Cathedral is the site of a monastery founded by St Brendan The Navigator in the 6th century. It can be found in the village of Ardfert, about 10km from Tralee, County Kerry. The site features three medieval churches and several grave slabs.

In the 6th century, St Brendan The Navigator founded a monastery at this site near Tralee in County Kerry. Today, visitors can see three medieval churches, an ogham stone, and a number of early Christian and medieval grave slabs.

The oldest building is the cathedral, which dates from the 12th to the 17th centuries. It has a Romanesque west doorway, a magnificent 13th-century east window and a spectacular row of nine lancets in the south wall. One of the two smaller churches is a fine example of the late Romanesque style and the other is a plain 15th-century structure with interesting carvings.