Hillingdon (officielt: The London Borough of Hillingdon) er Londons vestligste bydel. Den blev oprettet i 1965 ved at kredsene Uxbridge, Hayes and Harlington, Ruislip-Northwood og Yiewsley and West Drayton i Middlesex blev slået sammen.
Brunel University og London Heathrow Airport ligger i bydelen.
Steder i Hillingdon
Cowley Eastcote Eastcote Village Hatton Harlington Hayes Hayes End Hayes Town Harefield Harmondsworth Hillingdon Ickenham Longford Newyears Green North Hillingdon Northwood Northwood Hills Ruislip Ruislip Common Ruislip Gardens Ruislip Manor Sipson South Harefield South Ruislip Uxbridge West Drayton Yeading Yiewsley