Sydenham is a district of south-east London, England, which is shared between the London boroughs of Lewisham, Bromley and Southwark. Prior to the creation of the County of London in 1889, Sydenham was located in Kent, bordering Surrey. Historically, the area was very affluent, with the Crystal Palace being relocated to Sydenham Hill in 1854. Today, Sydenham is a diverse area, with a population of 28,378 and borders Forest Hill, Dulwich, Crystal Palace, Penge, Beckenham, Catford and Bellingham.

Lewisham is a London borough in south-east London, England. It forms part of Inner London. The principal settlement of the borough is Lewisham. The local authority is Lewisham London Borough Council, based in Catford. The Prime Meridian passes through Lewisham. Blackheath, Goldsmiths, University of London and Millwall F.C. are located within the borough.