St Deiniol's Church, Llanddaniel Fab, is a small 19th-century parish church in the centre of Llanddaniel Fab, a village in Anglesey, north Wales. The first church in this location is said to have been established by (to whom the church is dedicated) in 616. He was the son of St Deiniol, the first Bishop of Bangor. The current building, which is in Early English style, incorporates some material and fittings from an earlier church on the site, including the font and an 18th-century memorial in the porch. The vestry door has medieval jambs and the keystone of its arch, which is also medieval, is a carved human face. Some parts of the nave walls may also come from a previous building here.