Boscawen-Un is a Bronze age stone circle close to St Buryan in Cornwall, UK.
It is located at grid reference SW412274.

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.

The leaning stone aligns exactly with the centre stone at the Mên-an-Tol and the church at nearby St Buryan. While this may conceivably be coincidental, the precision of the alignment suggests an intentional positioning of the three structures in relation to each other.

Cornish Gorseth
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 in Dumnonia", which was taken to refer to Boscawen-Un by the Gorseth's founders.