The London Borough of Ealing is a London Borough in west London, England, and forms 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 towards the west, the London Borough of Harrow and the London Borough of Brent to the north, the London Borough of Hammersmith and Fulham to the east and the London Borough of Hounslow to the south. It covers a total area of around 21.44 square miles.
As recorded in population estimates from the middle of 2014, the borough includes a permanent population of around 342118 inhabitants. This makes it the third largest London Borough in population, and 11th biggest in size, covering a part of west London and also a small a part of northwest London. The local authority is Ealing London Borough Council.
The town is served by many National Rail and London Underground stations. As well as Brentford, the London Borough of Ealing is the setting for much of the action in Robert Rankin's trilogy comedic novels, The Brentford Trilogy, which presently contains six volumes. Ealing is also the key setting for 'The Sarah Jane Adventures', being the place of Sarah Jane Smith's residence. 330 hectares inside the borough are designated as part of the Metropolitan Green Belt.