Caerhays Castle (translation of caerhays into English: "enclosed castle") (alternate: Carhayes Castle) is a semi-castellated manor house located 0.5 mi (0.80 km) south of St Michael Caerhays, a village in Cornwall, England. It is situated overlooking Porthluney Cove on the English Channel. The castle garden hosts the largest collection of magnolias in England and contains one of four National Magnolia Collections under the auspices of the National Council for the Conservation of Plants and Gardens.