Warner Bros. Studios, Leavesden is a 80-hectare studio complex in Leavesden, Hertfordshire in southeastern England. Formerly known as Leavesden Film Studios and still colloquially known Leavesden Studios or simply Leavesden it is a major film and media complex owned by Warner Bros. The studios and backlot were all retrofitted as the site's original use was as a Rolls-Royce plc factory and airfield known as Leavesden Aerodrome, which was an important centre of aircraft production during World War II.