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 known from documentation of the 12th century, when Bishop Nicholas of Llandaff arbitrated the rights of its Welsh rector, Robert ab Eli, who also had held the churches of Llanllywel and Llangybi since the time of Bishop Urban (1107-34). The confirmed grants indicate that Llantrisant was at the time a collegiate or clas church with a district encompassing the middle Usk valley. The present 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 1880âÂÂ81.