Regency Square is a large early 19th-century residential development on the seafront in Brighton, part of the British city of Brighton and Hove. Conceived by speculative developer Joshua Hanson as Brighton underwent its rapid transformation from fishing village to fashionable resort, the three-sided "set piece" of around 70 houses and associated structures was designed and built over a ten-year period by Brighton's most important Regency-era architects: the partnership of Charles Busby, Amon Wilds and his son Amon Henry Wilds. The site was originally Belle Vue Field—used at various times as a military camp a showground and the location of a windmill.
The square was a prestigious, high-class development, attracting the social elite. The square gradually lost its prestige status after the First World War as hotels started to move in. The square's central garden, originally private, has been council-owned since 1884 and is publicly accessible, and an underground car park was built beneath it in 1969.
Most of the buildings in and around the square have been designated Listed buildings: six blocks of houses are each listed at Grade II*, the second-highest designation, while five other residential buildings, a war memorial, a nearby inn and a set of bollards outside it have each been given the lower Grade II status. The house at the southwest corner is now numbered as part of King's Road but was built as part of Regency Square, and is also Grade II*-listed.