Wallington is a town in the London Borough of Sutton, South London, England, 9.7 miles (15.6 km) south-west of Charing Cross. Before the Municipal Borough of Beddington and Wallington merged into the London Borough of Sutton in Greater London in 1965, it was part of the county of Surrey. Wallington is a post town in the SM postcode area.

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.