The Metropolitan Borough of Chelsea was a metropolitan borough of the County of London between 1900 and 1965. It was created by the London Government Act 1899 from most of the ancient parish of Chelsea. Following the London Government Act 1963, it was amalgamated with the Royal Borough of Kensington in 1965 to form the Royal Borough of Kensington and Chelsea.

Chelsea is an affluent area in West London, England, due south-west of Charing Cross by approximately 2.5 miles. It lies on the north bank of the River Thames and for postal purposes is part of the south-western postal area.