St John's Church, Barmouth, Gwynedd, Wales was built between 1889 and 1895 and designed by the Chester architects Douglas and Fordham. The foundation stone was laid by Princess Beatrice of the United Kingdom. The bulk of the cost of construction was donated by Mrs Sarah Dyson Perrins in memory of her husband James Dyson Perrins (father of Charles William Dyson Perrins) of Lea & Perrins. The church belongs to the Church in Wales. It is a grade II* listed building, and was given this status by Cadw on 31 January 1995. It is part of the Bro Ardudwy Ministry Area.