The London Borough of Ealing is a London Borough in west London, England, and forms a part of Outer London. The London borough was formed in 1965 by the merging the area of the Municipal Borough of Ealing, the Municipal Borough of Southall plus the Municipal Borough of Acton. The London Borough of Ealing borders the London Borough of Hillingdon to the west, the London Borough of Harrow plus the London Borough of Brent to the north, the London Borough of Hammersmith and Fulham to the east plus the London Borough of Hounslow towards the south. It covers a total area of around 21.44 square miles.
In accordance with population estimates from the middle of 2014, the borough has a permanent population of about 342118 inhabitants. This makes it the 3rd largest London Borough in population, and 11th biggest in size, covering part of west London as well as a small a part of northwest London. The local authority is Ealing London Borough Council.
The town is served by numerous National Rail and London Underground stations. As well as Brentford, the London Borough of Ealing is the setting for a lot of the action in Robert Rankin's series of comedic novels, The Brentford Trilogy, which presently is made up of six volumes. Ealing is also the primary setting for 'The Sarah Jane Adventures', being the location of Sarah Jane Smith's home. 330 hectares within the borough are designated as a part of the Metropolitan Green Belt.