| Church of St Peter, St Paul and St John, Llantrisant | |
| Denomination: | Church in Wales |
| Diocese: | Monmouth |
| Parish: | Heart of Monmouthshire Ministry Area (current), Llantrisant Fawr (ancient) |
| Benefice: | Heart of Monmouthshire Ministry Area |
| Deanery: | Heart of Monmouthshire Deanery |
| Archdeaconry: | Monmouth |
| Style: | Decorated |
| Years Built: | 13th century |
| Priest: | Reverend S L Ingle-Gillis[1] |
| Status: | Grade I listed |
| Location: | Llantrisant, Monmouthshire |
| Country: | Wales |
| Coordinates: | 51.6678°N -2.8817°W |
The Church of St Peter, St Paul and St John, is the parish church of Llantrisant, Monmouthshire, Wales. Described by the architectural historian, John Newman as "a handsome church" in the Decorated style, it has been a Grade I listed building since 18 November 1980.
The church is fourteenth century in origin but nothing remains of this period beyond a single lancet window in the nave. The remainder is of the fifteenth and sixteenth centuries, and of the restoration by E. A. Landsdowne in 1880–81.