Westdene is an area of the city of Brighton and Hove, East Sussex. It is an affluent northern suburb of the city, west of Patcham, the A23 (London Road) and the London to Brighton railway line, north of Withdean and northeast of West Blatchington. It is on the Brighton side of the historic parish boundary between Brighton and Hove and is served by Preston Park railway station. It is known for its greenery and woodland and is very close to the South Downs, from which it is separated by the Brighton Bypass, and was built on the slopes of two hills.