The River Wandle is a river in south-east England. The river runs through southwest London.

Rain falls on the North Downs, filters through the chalk and emerges on the spring line. The river is first visible at Wandle Park in Croydon. It passes through the London Boroughs of Croydon, Sutton, Merton, and Wandsworth to join the River Thames at Wandsworth. The River Wandle is between 9 and 11 miles long.