Colney Hatch (/ˈkoʊnɪ ˈhætʃ/ is the historical name for a small district within the London Borough of Barnet in London, England. The name Colney Hatch was originally that of a hamlet in the parish of Friern (once spelt Fryern) Barnet, first recorded in the early 15th century. It became well known from the mid-19th century following the building of Colney Hatch Lunatic Asylum, which gained such notoriety that the name "Colney Hatch" appeared in various terms of abuse associated with the concept of madness.