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.

• 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

51°32′37″N 0°28′34″V / 51.5436°N 0.4761°V / 51.5436; -0.4761