Cashtal yn Ard (Castle of the Heights) is a Neolithic chambered tomb in Cornaa, in the parish of Maughold in the Isle of Man.

[1] It is situated on a low hill overlooking much of the surrounding parish of Maughold and across to the Lake District in England.

[8] It is likely that the tomb was originally constructed as a single burial chamber, but as successive significant members of the community died, the site was expanded to accommodate them.

Flints and shards of Neolithic pottery were discovered during investigations of the chambers, as well as at least 125 white sea pebbles which have been found at many Manx archaeological sites.

Fleure and Neely highlighted the resemblance between Cashtal yn Ard and the cairns of Giants' Tombs in Sardinia and Bridestones in Cheshire, England.