Hornsey, also known as Hornsey St Mary or Haringay, is one of the ancient parishes of Middlesex. In 1894 it became an Urban District, which was incorporated in 1903 to become a Municipal Borough. Hornsey Municipal Borough was abolished in 1965, becoming part of the London Borough of Haringey (which takes its name from a variant spelling of one of the variant names of this parish).
Hornsey is a district of north London, England in the London Borough of Haringey. Hornsey has been a much larger ancient parish than the electoral ward of the same name, in turn a smaller entity than the Municipal Borough of Hornsey which co-governed its area with Middlesex County Council from 1889 to 1965, since which time, the name usually refers only to the London neighbourhood at the heart of these former areas to the west of Hornsey railway station. It is an inner-suburban, for the most part residential, area centred north of Charing Cross.