Saint Ceneu () was an early bishop of Menevia (St Davids) in Wales in the sixth century. Giraldus Cambrensis, writing in the twelfth century, stated that Ceneu was the third bishop.

He is said to have been the son of Corun ap CeredigSabine Baring-Gould, Sabine & al. The Lives of the British Saints, Vol. 2, p. 106. Kessinger Publishing, 2005. Accessed 26 Mar 2013. or Coel Hen. He established a church or monastic community (clas) at the site of the current settlement of Clydau in North Pembrokeshire which was long known as Llangeneu (Church of Ceneu) in his honour.James, Heather. "The Geography of the Cult of St Davids" in St David of Wales: Cult, Church and Nation, p. 59. Boydell Press, 2007. Accessed 26 Mar 2013. No traces of the settlement are known to survive, and are thought to have been destroyed when there was significant immigration by Flemings settling into the area.

His feast day is 15 June.

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