The Luxulyan Valley (Cornish: Glynn Gwernan, meaning alder tree valley) is the steep sided and thickly wooded valley of the River Par, situated in mid Cornwall, England, UK. It contains a major concentration of early 19th century industrial remains, and was designated as part of a World Heritage Site in 2006.
The valley stretches south-east from the village of Luxulyan 50°23′24″N 4°44′38″W / 50.390°N 4.744°WCoordinates: 50°23′24″N 4°44′38″W / 50.390°N 4.744°W. It reaches as far as the edge of the built-up area around the town of St Blazey and the port of Par, a distance of some 5 km. It lies within the civil parishes of Luxulyan, Lanlivery and Tywardreath, and is one of the areas (designated A8i in the original nomination) of the larger, but discontinuous, Cornwall and West Devon Mining Landscape World Heritage Site.