Er nad yw Castlebeck yn darparu unrhyw wasanaethau yng Nghymru, mae is-gwmni o’i eiddo, Mental Health Care UK (MHC), yn rhedeg 3 ysbyty annibynnol ac 13 o gartrefi gofal cofrestredig yn y Gogledd, yn darparu gofal i bobl ag anableddau dysgu a phroblemau iechyd meddwl. Mae’r ysbytai wedi’u cofrestru gydag Arolygiaeth Gofal Iechyd Cymru (AGIC) ac mae’r cartrefi gofal wedi’u cofrestru gydag Arolygiaeth Gofal a Gwasanaethau Cymdeithasol Cymru (AGGCC).
Whilst Castlebeck does not provide any services in Wales, a subsidiary company Mental Health Care UK (MHC) , operates three independent hospitals and 13 registered care homes in North Wales providing care for people with mental health and learning disabilities. The hospitals are registered with Healthcare Inspectorate Wales (HIW) and the care homes are registered with Care and Social Services Inspectorate Wales (CSSIW).