St Anne's Unit, Sacred Heart Hospital is an approved inpatient mental health centre in Castlebar, County Mayo, run by the Health Service Executive (HSE). St Anne’s Unit is a single storey building situated on the wider campus of the Sacred Heart Hospital in Castlebar, Co. Mayo. It provides care to people over 65 years with severe challenging behaviour associated with dementia. It accommodates residents in single and shared bedrooms. It has places for up to 8 residents. It is registered with the Mental Health Commission.