The Cassington Canal was an early 19th-century canal near Eynsham, Oxfordshire. The canal was built by the 4th Duke of Marlborough to provide a link between the River Thames and Cassington Mill; it later provided alternative wharfage to that at Eynsham. The 0.75-mile (1.21 km) canal was in operation for less than 70 years, its use declining with the advent of rail transport.