St Mary's Hospital is an NHS hospital in Paddington, in the City of Westminster, London, founded in 1845.Since the UK's first academic health science centre was created in 2008, it has been operated by Imperial College Healthcare NHS Trust, which also operates Charing Cross Hospital, Hammersmith Hospital, Queen Charlotte's and Chelsea Hospital and the Western Eye Hospital.
It started when two obstetricians working in the maternity unit at the hospital were inspired to start fundraising for more research into pregnancy problems. It funds three research centres in the UK, including St Thomas' in London, Saint Mary's Hospital, Manchester, and the recently established Royal Infirmary of Edinburgh. Name
Medical Education at St Bartholomew's Hospital 1123–1995 (2003) 464pp. Waddington, Keir. "Mayhem and Medical Students: Image, Conduct, and Control in the Victorian and Edwardian London Teaching Hospital," Social History of Medicine (2002) 15#1 pp 45–64. External links
It shares its main hospital site in Tooting in the London Borough of Wandsworth, with St George's, University of London, which trains NHS staff and carries out advanced medical research. The hospital has around 1,300 beds and most general tertiary care such as accident and emergency , maternity services and care for older people and children .
It was formed in 1995 by the merger of the London Hospital Medical College (the first school to be granted an official charter for medical teaching in 1785) and the Medical College of St Bartholomew's Hospital (the oldest remaining hospital in the United Kingdom, having been founded in 1123, with medical teaching beginning from that date).
The St George's University of London campus is located in the Tooting area of south-west London, and is co-located with St George's Hospital, a 1,300 bed major trauma centre.  Teaching facilities at the campus include clinical skills laboratories and a simulation suite allowing students to practice based on real-life situations including surgical and medical emergencies. 
During the 17th and 18th centuries, the university had mixed fortunes and was often beset by civil and religious disturbances. In a particularly acute depression in 1747, severe financial problems triggered the dissolution of St Leonard's College, whose properties and staff were merged into St Salvator's College to form the United College of St Salvator and St Leonard.