Waterside Mill, Ashton-under-Lyne was a combined cotton spinning weaving mill in Whitelands, Ashton-under-Lyne, Greater Manchester, England. It was built as two independent factories. The weaving sheds date from 1857; the four-storey spinning mill dates from 1863. The spinning was taken over by the Lancashire Cotton Corporation in the 1930s. Production finished in 1959. Waterside Mill was converted to electricity around 1911.