Ariel Motorcycles was a British motorcycle manufacturer based in Bournbrook, Birmingham. It was one of the leading innovators in British motorcycling, and was part of the Ariel marque. The company was sold to BSA in 1951 but the Ariel brand survived until 1967. Influential Ariel designers included Val Page and Edward Turner. The last motorcycle-type vehicle to carry the Ariel name was a short-lived 3-wheel tilting moped launched in 1970.
Ariel made bicycles before making motorcycles, and also made automobiles. Car production began in 1902 and moved to Coventry in 1911, but ceased in 1925.
The 'Ariel' name was reused in 1999 for the formation of Ariel Ltd, a sports car producer.