Llanfair-yn-Neubwll is a village and community on the Isle of Anglesey in the north west of Wales.

The community includes the villages of Llanfihangel yn Nhowyn and Caergeiliog, and had a population of 1,688,[1] increasing to 1,874 at the 2011 census.

[2] The community is heavily connected to the nearby Royal Air Force airfield, RAF Valley, established on Tywyn Trewan during the Second World War, and still in use.

[3] Llanfair-yn-Neubwll lies on the western coast of Anglesey, looking out towards Holy Island.

The community is served by the nearby railway station at Valley on the North Wales Coast Line.