Llangeinwen Church is located on the A4080 road between Dwyran and Newborough in the south west of Anglesey, North Wales.
The church is thought to have been established by St Ceinwen, the daughter of King Brychan of Brycheiniog, at the end of the sixth century. The present church building dates back to the middle ages but with nineteenth century additions, including the tower. The first stone church was built on this site during the 12th century and the north and south walls of the nave date from this period, the chancel was built during the mediaeval period and its walls date from this time, the nave roof however is late mediaeval. There are a number of important early mediaeval gravestones built into the fabric of the church.