Pentraeth is a village and community on the island of Anglesey, North Wales, at grid reference SH523786. The Royal Mail postcode begins LL75. The community population taken at the 2011 census was 1,178. The village itself having a population of 557.

Anglesey is an island off the north-west coast of Wales. It forms the bulk of the county known as the Isle of Anglesey, which also includes Holy Island and some islets and skerries. The county borders Gwynedd across the Menai Strait to the southeast, and is otherwise surrounded by the Irish Sea. Holyhead is the largest town, and the administrative centre is Llangefni. The county is part of the preserved county of Gwynedd.