Sipson is a village in the London Borough of Hillingdon, the westernmost borough of Greater London, England. It is 14.3 miles (23 km) west of Charing Cross and near the north perimeter of London Heathrow Airport.

The London Borough of Hillingdon is the largest and westernmost borough in West London, England. It was formed in 1965 from the districts of Hayes and Harlington, Ruislip-Northwood, Uxbridge, and Yiewsley and West Drayton in the ceremonial county of Middlesex. Today, Hillingdon is home to Heathrow Airport and Brunel University, and is the second largest of the 32 London boroughs by area.