Debdon Burn is a small river which is a tributary of the River Coquet in Northumberland. It feeds Debdon Lake and Tumbleton Lake as it flows south through the Cragside Estate, where it joins the Coquet. Lord Armstrong harnessed the power of the burn to provide hydroelectric power to his house at Cragside. Armstrong also built the Iron Bridge over the Debdon Burn in the 1870s. A stone bridge was also built over the burn, south of the Iron Bridge, in the late 19th century.