Longdale Furnace is an unincorporated community located east of Clifton Forge in Alleghany County, Virginia, United States.

Much of the community was designated a national historic district and added to the National Register of Historic Places in 1998.

It includes the original stone furnace stack (1827), two-story Longdale Iron Company Office (late-1820s), Longdale Iron Company Laboratory, two tall cylindrical brick chimneys, brick machine shop, Firmstone-Johnson House (1870s–1880s), the Queen Anne-style Assistant Manager's House (1870s–1880s), and the Company Doctor's Office.

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