The Aeronautical Syndicate Limited (ASL) was one of the earliest aeroplane manufacturers. A British company, it was founded in 1909 by the investor Horatio Barber and engineers William Oke Manning and Howard T. Wright. Initially located in Battersea, London, the business soon relocated to Larkhill on Salisbury Plain. It later moved to the Aeronautical Syndicate Flying School, Hendon. The company closed in 1912. ASL were most well known as manufacturer of the ASL Valkyrie series of tail-first or canard monoplanes.