The London Borough of Sutton is an Outer London borough in London, England. It covers an area of 43 km2 (17 sq mi) and is the 80th largest local authority in England by population. It borders the London Borough of Croydon to the east, the London Borough of Merton to the north and the Royal Borough of Kingston upon Thames to the north-west; it also borders the Surrey boroughs of Epsom and Ewell to the west and Reigate and Banstead to the south. The local authority is Sutton London Borough Council. Its principal town is Sutton.

The Royal Borough of Kingston upon Thames is a borough in southwest London. The main town is Kingston upon Thames and it includes Chessington, Malden Rushett, New Malden, Surbiton and Tolworth. It is the oldest of the four royal boroughs in England. The others are Windsor and Maidenhead, the site of Windsor Castle, and the London boroughs of Greenwich, and Kensington and Chelsea. The local authority is Kingston upon Thames London Borough Council.