An Coillín is an approved inpatient mental health centre in Castlebar, County Mayo, run by the Health Service Executive (HSE). An Coillín is a single storey building adjacent to the Mayo University Hospital, in Castlebar, Co. Mayo. The approved centre is registered with the Mental Health Commission for the provision of continuing mental health care and it can accommodate residents in a combination of single en suite bedrooms, as well as shared bedrooms. It is registered with the Mental Health Commission.