Abbots Langley is a large village and civil parish in the English county of Hertfordshire. It is an old settlement and is mentioned in the Domesday Book. Economically the village is closely linked to Watford and was formerly part of the Watford Rural District. Since 1974 it has been included in the Three Rivers district.

Three Rivers is a local government district in south-west Hertfordshire, England. Its council is based in Rickmansworth. The district borders Hertsmere, Watford, St Albans, Dacorum, Buckinghamshire, and the London boroughs of Hillingdon and Harrow.