Forty Hill is a largely residential suburb in the north of the London Borough of Enfield, England. To the north is Bulls Cross, to the south Enfield Town, to the west Clay Hill, and to the east Enfield Highway. Prior to 1965 it was in the historic county of Middlesex.

The London Borough of Enfield is a London borough in North London. It borders the London boroughs of Barnet to the west, Haringey to the south, and Waltham Forest to the southeast. To the north are the districts of Hertsmere, Welwyn Hatfield and Broxbourne, and to the east is Epping Forest District in Essex. The local authority is Enfield London Borough Council. Enfield's population is estimated to be 333,794; the main towns in the borough are Edmonton, Enfield, Southgate and Palmers Green. Enfield is the northernmost London borough.