Trethurgy is a village in the parish of Treverbyn, Cornwall, England, United Kingdom. It is about two miles northeast of St Austell. Carne Farm, Trethurgy is the birthplace of Silvanus Trevail, a president of the Society of Architects and the architect of many well known Cornish hotels such as the Headland Hotel, Newquay and the Carbis Bay Hotel, Carbis Bay.