| St Sadwrn's Church | |
| Imagealt: | A small single-story church with bells hanging from a small stack, in a graveyard. |
| Country: | Wales, United Kingdom |
| Denomination: | Church in Wales |
| Architectural Type: | Church |
| Heritage Designation: | Grade II* |
| Designated Date: | 30 January 1968 |
| Style: | Medieval |
St Sadwrn's Church, Llansadwrn (pronounced as /cy/) 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.[1]