The London Borough of Waltham Forest is an outer London borough formed in 1965 from the merger of the municipal boroughs of Leyton, Walthamstow and Chingford.

Leyton was a local government district in southwest Essex, England, from 1873 to 1965. It included the neighbourhoods of Leyton, Leytonstone and Cann Hall. It was suburban to London, forming part of the London postal district and Metropolitan Police District. It now forms the southernmost part of the London Borough of Waltham Forest in Greater London.