Hertsmere is a local government district with borough status in Hertfordshire, England. Its council is based in Borehamwood. Other settlements in the borough include Bushey, Elstree, Radlett and Potters Bar. The borough contains several film studios, including Elstree Studios and the BBC Elstree Centre at Borehamwood. The borough borders Three Rivers, Watford, St Albans, and Welwyn Hatfield in Hertfordshire and the three north London boroughs of Harrow, Barnet and Enfield. Hertsmere is located mainly within the M25 Motorway.

Borehamwood is a town in southern Hertfordshire, England, 12 miles (19 km) from Charing Cross. Borehamwood has a population of 36,322, and is within the London commuter belt. The town's film and TV studios are commonly known as Elstree Studios.