Barnes is a district in south London, England, part of the London Borough of Richmond upon Thames. It takes up the extreme north-east of the borough, and as such is the closest part of the borough to central London. It is centred 5.8 miles (9.3 km) west south-west of Charing Cross in a bend of the River Thames.

The London Borough of Richmond upon Thames in southwest London, England, forms part of Outer London and is the only London borough on both sides of the River Thames. It was created in 1965 when three smaller council areas amalgamated under the London Government Act 1963. It is governed by Richmond upon Thames London Borough Council and is divided into nineteen wards. The population is 198,019 and the major settlements are Barnes, East Sheen, Mortlake, Kew, Richmond, Twickenham, Teddington and Hampton.