Llansadwrn is a small village in the community of Cwm Cadnant in south-east Anglesey, in north-west Wales. It lies between Menai Bridge, Pentraeth and Beaumaris. It is named after the church, founded in the 6th century by Saint Saturninus, who together with his wife, is commemorated by an early Christian monument.
St Sadwrn's church is a grade II* listed building. 
- "Church of St Sadwrn, Cwm Cadnant". British Listed Buildings. Retrieved 12 January 2014.
- Right from the start: The Memoirs of Sir Wyn Roberts
V.E.Nash-Williams, The Early Christian Monuments of Wales, Cardiff, 1950 .
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