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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.
The borough is home to Richmond Park, the largest park in London, along with the National Physical Laboratory and The National Archives. The attractions of Kew Gardens, Hampton Court Palace, Twickenham Stadium and the WWT London Wetlands Centre are within its boundaries and draw domestic and international tourism. In 2023, the borough was ranked first in Rightmove's Happy at Home index, making it the "happiest place to live in Great Britain"; the first time a London borough has taken the top spot.