Coordinates: 51°24′N 0°11′E / 51.4°N 0.18°E / 51.4; 0.18

Swanley is a town and civil parish in the Sevenoaks District of Kent, England. It is located on the south-eastern outskirts of London, north of Sevenoaks town. The town boundaries encompass the settlements of Swanley itself, Hextable (Hextable recently voted to become an independent parish council) and Swanley Village. Swanley has a population of 20,986

In 1066, Swanley only consisted of a few cattle farms, surrounded in oak, sycamore and ash (Fraxinus) woodland. Because Swanley only consisted of a few homesteads,so it was not mentioned in the Domesday Book.

There is a theory that the placename Swanley developed from the Saxon term 'Swine-ley', "Ley" meaning a clearing in the woods and "swine" meaning pigs. So it has been suggested that it was originally a Saxon pig farm. This later developed into what we now know as Swanley. There is however no clear evidence that the derivation of the placename Swanley is 'a clearing for pigs'. This fiction may have been invented by a history teacher at Swanley School sometime in the late 1960s as a backhanded insult towards the kids he or she was expected to teach. If Swanley was a Saxon name chances are it would have received mention in Domesday. It didn't. The name is just as likely to be derived from the personal name Sven, Svein or something similar.