Boscawen-Un is a Bronze age stone circle close to St Buryan in Cornwall, UK. It consists of 19 upright stones in an ellipse with diameters 24.9m and 21.9m, with another, leaning, stone just south of the centre. There is a west-facing gap in the circle, which may have formed an entrance. It is located at .
The Gorseth Kernow was inaugurated here in 1928. An old Welsh triad mentions one of the three principal gorseddau of the Island of Britain as "Beisgawen yn Nyfnwal" (Boscawen in Dumnonia), which was taken to refer to Boscawen-Un by the Gorseth's founders.