Sydenham is an area and electoral ward in the London Borough of Lewisham; although some streets towards Crystal Palace Park, Forest Hill and Penge are outside the ward and in the London Borough of Bromley, and some streets off Sydenham Hill are in the London Borough of Southwark. Sydenham was in Kent until 1889 when the County of London was created. The population of the Sydenham ward in 2007 was 14,650, Upper Sydenham is included in Forest Hill ward.
Sydenham is most famous as the location where the Crystal Palace from the Great Exhibition was relocated. Famous people who have lived here include Ernest Shackleton, the Antarctic explorer; George Grove of musical dictionary fame; John Logie Baird, the television inventor; Jason Statham, an actor; and Dame Cicely Saunders, founder of the modern hospice movement.