Penmon is a promontory, village and ecclesiastical parish on the eastern tip of the Isle of Anglesey in Wales, about 3 miles east of the town of Beaumaris. It is in the community of Llangoed. The name comes from Welsh: pen and Môn, which is the Welsh word for Anglesey. It is the site of a historic monastery and associated 12th-century church. Walls near the well next to the church may be part of the oldest remaining Christian building in Wales.