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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 village's name was recorded as Sibwineston c. 1150 and as Sibeston in 1341. It comes from the Anglo-Saxon Sibwines tun, "Sibwine's homestead or village".

The place was a farmstead, one of three in Harmondsworth parish, south and east of the heart of that village. It had by the 1890s grown in population and gained a chapel at Sipson Green, where 18th century cottages were at the end of what by 1910 had become a semi built-up village street or lane leading to the earlier farmstead and farm workers cottages. All of these places, as today, lie north of the famous "Bath Road" (the modern A4), which linked London to Bath.

In 2009 the majority of the village was under threat of demolition owing to the planned expansion of London Heathrow Airport, which would have created a third runway at the airport. However, in March 2010 in accordance with multilateral environmental regulations and evidence that gas pollutant thresholds would be further breached within the wider area the English High Court of Justice ruled that the plan which the Department had submitted must be reconsidered. Accordingly, the Government announced in May 2010 that the third runway plan had been cancelled but that a long-term study into airport capacity in the South East and beyond may recommend expansion to any of the London Airports where the environmental constraints can all be met. Since 2009 BAA have been acquiring property in Sipson and elsewhere when advertised for sale which means there will be fewer resident owners to oppose further plans for expansion with a third runway. Contrary to this movement, opponents such as actress Emma Thompson and various others have bought land within the boundaries in 2009 with a view to preventing such expansion. In addition to this there has been a long term occupation of land within Sipson by climate activists on the invitation[citation needed] of local residents, following the latest Climate Camp. Grow Heathrow is a squatted community, opposed to the expansion of Heathrow airport and committed to finding sustainable alternatives in the face of climate change, peak oil and economic crises. On 2020-02-27 A court ruled the expansion unlawful in a case brought by environmental groups, councils and the Mayor of London. The court said the government would not appeal against the judgement.