It is not clear where the name itself came from. A large manor house was built for the Countess of Chesterfield in the 1660s.
In the 1700s a coal merchant made a business there offering cheap weddings so long as the couple had their wedding party in the grounds. Later the grounds were used for various forms of entertainment including hunting deer, racing and dancing. The manor house was taken back into private use in the later 18th century and Spencer Percival, later a prime minister, lived there. In 1854 house was demolished and new housing developments covered up the gardens. Belsize Park is all that remains.
Belsize Park is essentially the area immediately west of Haverstock Hill. Belsize Village, as it is now known, is centred on Belsize Lane. Some of the best properties in this area are in Parkhill Road, Park Road and North Road. There are flats in Haverstock Hill, and there are some large mansion blocks there. Belsize Avenue is the centre of the area. To the north, there are attractive houses in roads leading to Lyndhurst Gardens and Wedderburn Road. Belsize Park, Belsize Park Gardens and Belsize Square run to the south. These all contain attractive houses, many converted into flats. “The Glens” – Glenloch, Glenilla and Glenmore Roads – close to the tube station contain sought after Victorian terraced houses. Between Belsize Park and Chalk Farm there are more terraced houses in the group of streets containing Primrose Gardens and surrounding streets. Antrim Mansions is a large mansion block in Antrim Road. Nearly at Chalk Farm, Steels Road and surrounding streets contain some of the largest houses in the area.