Osterley Park is a large park and one of the largest open spaces in London. In its grounds, there is a large mansion which is often referred to as 'Osterley House'. The park lies between Osterley, Isleworth; Heston, Hounslow; Norwood Green, Southall, Hanwell, Ealing and Brentford, in the London Boroughs of Hounslow and Ealing. It is operated by the National Trust.
When the house was built it was surrounded by countryside. It was one of a group of large houses close to London which served as country retreats for wealthy families. Other surviving country retreats of this type near London include Syon House and Chiswick House. The park is one of the largest open spaces in west London, although the M4 motorway cuts across the middle of it.
