| Longdale Furnace Historic District | |
| Nrhp Type: | hd |
| Nocat: | yes |
| Designated Other1: | Virginia Landmarks Register |
| Designated Other1 Date: | April 28, 1995[1] |
| Designated Other1 Number: | 003-0338 |
| Designated Other1 Num Position: | bottom |
| Location: | Roughly, along Longdale Furnace Rd., Iron Ore Ln., Church Rd. and Conner Ln., near Clifton Forge, Virginia |
| Coordinates: | 37.8092°N -79.6844°W |
| Architecture: | Queen Anne, Federal |
| Added: | August 3, 1995 |
| Refnum: | 95000898 |
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. The district encompasses 27 contributing buildings, 8 contributing sites, and 3 contributing structures historically associated with the Longdale Iron Company foundries' operations and personnel. 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.[2]