St Sadwrn's Church, Llansadwrn (Welsh: [ɬanˈsadʊrn]) is a church in the village of Llansadwrn, Anglesey, Wales. It is dedicated to the Welsh saint Sadwrn, who is commemorated in a 6th-century inscribed stone inside the church. The current building was built in 1881, on the foundations of a medieval predecessor, to a design by Henry Kennedy of Bangor. It was designated a Grade II*-listed building on 30 January 1968.

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53°15′36″N 4°10′10″W / 53.2601°N 4.1694°W / 53.2601; -4.1694