Rinsey is a hamlet in Cornwall, England, United Kingdom. It is located off the main A394 road between Helston and Penzance in the civil parish of Breage. The nearby hamlet of Rinsey Croft is located 1 km to the north-east. The nearby cliffs and beach are owned and managed by the National Trust and part of Rinsey East Cliff is designated as the Porthcew Site of Special Scientific Interest (SSSI) for its geological interest. The South West Coast Path passes through the property. Rinsey lies within the Cornwall Area of Outstanding Natural Beauty (AONB). Almost a third of Cornwall has AONB designation, with the same status and protection as a National Park.
Rinsey, in the Hundred of Kerrier, is mentioned in the Domesday Book as one of four Manors in the parish of Breage, under the name of 'Rentis'. The population in 1086 was 9.5 households.
In the 29 April 1880 edition of The Cornishman, Rinsey was listed as one of the places in the Helston area with a fishing fleet.
Wheal Prosper, (grid reference SW593270) on Rinsey East Cliff, started operating in 1860 possibly as an extension of Wheal Trewarvas mine, 800m to the east on Trewarvas Cliff (grid reference SW600265). The mine is on the southern end of the Tregonning granite within the Wendron Mining District. By the time Prosper closed in 1866 it had produced mostly tin and a little copper from the Porthcew lode. The prominent house on Rinsey Head is often said to have been the mine's count house (offices), it was built in the late 1920s and early 1930s by Mr G A Gibb, a London , after he bought the land from Mr Bucket, a local farmer. Designed as an Arts and Craft style holiday home, rock had to be blasted in order to build the foundations, taking four years to build with stone from a local quarry.