Dyffryn Gardens, also spelt Duffryn Gardens, is a collection of botanical gardens located near the villages of Dyffryn and St. Nicholas in the Vale of Glamorgan, Wales. The gardens were selected by the British Tourist Authority as one of the Top 100 gardens in the UK and are in the care of the National Trust. They are designated at Grade I, the highest grade, on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.