The Metropolitan Borough of Southwark was a metropolitan borough in the County of London from 1900 to 1965. The borough was one of two created in the Southwark area by the London Government Act 1899. It was formed from the areas of three local authorities: St Saviours District Board of Works (the civil parishes of Southwark Christchurch and Southwark St Saviours) and the incorporated vestries of Newington and Southwark St George the Martyr. The remaining, eastern, part of Southwark (the parishes of St John Horsleydown and St Olave & St Thomas) was combined with Bermondsey and Rotherhithe Districts