Coedarhydyglyn or Coedriglan, formerly Old Coedarhydyglyn (meaning 'the wood along the glen'), is a private Grade I listed neo-classical regency villa and estate on the western rim of Cardiff, less than half a mile from Culverhouse Cross, southeast Wales. It is accessed via the A48 road between Cardiff and St. Nicholas at the top of "The Tumble" hill leading up from Culverhouse Cross and Coedarhydyglyn Lane which leads to Drope to the north. The estate lies between the villages of St Georges-super-Ely (to the northwest) and Downs (to the south) just inside the boundary of the Vale of Glamorgan.