Rock Spring Farm | |
 | |
  Location within Northern Virginia  Location within Virginia  Location within the United States | |
| Location | 329 Loudoun St. SW, Leesburg, Virginia |
|---|---|
| Coordinates | 39°6′58″N 77°34′29″W / 39.11611°N 77.57472°W |
| Area | 5.5 acres (2.2 ha) |
| Built | c. 1826, 1906 |
| Architectural style | Federal, Colonial Revival |
| NRHP reference No. | 02000177 |
| VLR No. | 253-5046 |
| Significant dates | |
| Added to NRHP | March 13, 2002 |
| Designated VLR | December 5, 2001 |
Rock Spring Farm is a historic home located at Leesburg, Loudoun County, Virginia. The original section of the house was built about 1826, with wing and one-story addition built about 1906, and hyphen in 1980 to connect to the original brick kitchen. It consists of a 2+1⁄2-story, four-bay, brick main block in the Federal style with a two-story rear ell and flanking wings. The house was updated near the turn of the 20th century with Colonial Revival-style details. Also on the property are a contributing spring house, smokehouse, barn, dairy, silo, tractor shed, and stable.
It was listed on the National Register of Historic Places in 2002.
It housed a dairy operation until 1977 and served as Leesburg's main source of water until the 1980s; it ceased to be a working farm in 2025.
In March 2026, the City of Leesburg narrowly approved a $5.78 million purchase of the farm from Jack Cook following the death of his wife, Agnes diZerega Cook, who had hoped that it would become parkland.
Vice Mayor Todd Cimino-Johnson opposed the purchase, stating that the town had agreed to pay "double what the appraisal says."
