Llanfair-Mathafarn-Eithaf is a parish and community in Anglesey, Wales including the small seaside town of Benllech. The community population taken at the 2011 census was 3,382. Local buildings include the medieval St Mary's Church, where the 18th century poet Goronwy Owen once served as curate. The parish has five Scheduled Monuments, including two collections of hut circles and the stone remains of a dolmen type Neolithic burial mound, called the Pant-y-Saer Cromlech.