Duncan Springs (formerly, Duncan Mineral Springs) is a set of springs and the site of a resort from the 1880s in Mendocino County, California, United States. It is located south-southwest of Hopland, at an elevation of 781 feet (238 m). Duncan Springs was a resort by the 1880s.

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* Unincorporated communities in California Unincorporated communities in Mendocino County, California {{MendocinoCountyCA-geo-stub