St Bartholomew's Hospital, also known simply as Barts and later more formally as The Royal Hospital of St Bartholomew, is a hospital located at Smithfield in London.
It is the oldest hospital in Europe, having been founded in 1123.
Today it forms part of Barts Health NHS Trust.
Barts was founded in 1123 by Rahere (died 1144, and entombed in the nearby Priory Church of St Bartholomew the Great), a favourite courtier of King Henry I. The Dissolution of the Monasteries did not affect the running of Barts as a hospital, but left it in a precarious position by removing its income. It was refounded by King Henry VIII in December 1546, on the signing of an agreement granting the hospital to the Corporation of London, which was reaffirmed by Letters Patent of January 1547 endowing it with properties and income entitlements. The hospital became legally styled as the "House of the Poore in West Smithfield in the suburbs of the City of London of Henry VIII's Foundation", although the title was never used by the general public. The first Superintendent of the hospital was Thomas Vicary, sergeant-surgeon to King Henry, and an early writer on anatomy.