Clapton Square is the second largest garden square in the London Borough of Hackney, located in Lower Clapton, Clapton. It is lined by buildings on three sides. Its Conservation Area designated in 1969 – extended in 1991 and 2000 – takes in a larger green space separated by a stretch of open road: St John's Gardens. Those gardens have the tallest and largest building visible from all parts of the square's garden, the Church of St John-at-Hackney, rebuilt in 1792-97 which contains older monuments. Two sides of the square are lined with tall, partly stone-dressed, classical, Georgian terraced houses.

The London Borough of Hackney is a London borough in Inner London, England. The historical and administrative heart of Hackney is Mare Street, which lies 5 miles (8 km) north-east of Charing Cross. The borough is named after Hackney, its principal district. Southern and eastern parts of the borough are popularly regarded as being part of east London that spans some of the traditional East End of London with the northwest belonging to north London. Its population is estimated to be 281,120.