Coordinates: 51°31′58″N 0°27′18″W / 51.5329°N 0.4550°W / 51.5329; -0.4550

Hillingdon is a suburban area within the London Borough of Hillingdon, situated 14.2 miles (22.8 km) west of Charing Cross.

Much of Hillingdon is represented as the Hillingdon East ward within the local authority, Hillingdon Council. In November 2010, the ward had a recorded population of 12,403.

The name Hillingdon appears in the Domesday Book (1086) as Hillendone, possibly meaning "hill of a man named Hille".

Hillingdon was an ancient parish, and had within it the chapelry of Uxbridge, which became a separate civil parish in 1866. Under the Local Government Act 1894, Hillingdon parish was divided in two. Hillingdon West became, with Uxbridge, part of the Uxbridge Urban District; Hillingdon East became part of the Uxbridge Rural District.

Uxbridge Rural District was abolished in 1928, with the East parish being added to Uxbridge Urban District. Both East and West parishes were abolished in 1938 and added to Uxbridge parish. The name was revived in 1965, consequent upon the London Government Act 1963, as the name of the western-most borough of Greater London.