Alderney Hospital is a National Health Service hospital in Alderney (a suburb of Poole, Dorset) and is a part of Dorset Healthcare University NHS Foundation Trust.

Alderney Hospital was commissioned in 1889 by Poole Rural District Council as an isolation hospital; the hospital provided care for people suffering from a range of infectious diseases including typhoid and diphtheria. Smallpox care was not provided here, instead being provided at Baiter Hospital – erected during the 1887 epidemic.

Poole Rural Sanitary District was abolished by The Local Government Act 1894; by 1912 Poole Town Council had assumed responsibility for the hospital.

In 2018, £5.9 million was given by the Department of Health to aid older people's inpatient mental health services at the hospital.

Alderney Hospital provides in-patient assessment and treatment services to older adults with organic mental health disorder across two wards. St Brelades is a 17-bed ward for males and Herm is a 23-bed ward for both sexes.

The hospital also provides inpatient physical rehabilitation services to older people across two wards, Guernsey and Jersey, totalling 48 beds.

Haymoor Day Hospital, sometimes referred to as Haymoor Day Centre, is located on the grounds of Alderney Hospital. The unit provides non-residential care for those experiencing mental health crisis in an effort to avoid hospital admission.

• Healthcare in Dorset
• List of hospitals in the United Kingdom