Friern Hospital was a psychiatric hospital in the parish of Friern Barnet close to a crossroads which had a hamlet known as Colney Hatch. In 1965, it became part of the London Borough of Barnet and in the early 21st century was converted to residential housing as Princess Park Manor and Friern Village. The hospital was built as the Second Middlesex County Asylum and was in operation from 1851 to 1993. After the County of London was created in 1889 it continued to serve much of Middlesex and of the newer county, London. During much of this time its smaller prototype Hanwell Asylum also operated.

Friern Barnet is a suburban area within the London Borough of Barnet, 7.4 miles (11.9 km) north of Charing Cross. Its centre is formed by the busy intersection of Colney Hatch Lane, Woodhouse Road and Friern Barnet Road.