Cataract Dam, one of four dams and weirs in the catchment of the Upper Nepean Scheme, in New South Wales, Australia, provides water to the Macarthur and Illawarra regions, the Wollondilly Shire, and metropolitan Sydney. Completed in 1907 under the supervision of Ernest Macartney de Burgh, the dam is currently managed by the Sydney Catchment Authority and is listed on the NSW State Heritage Register.