Grundy
- County:
- Buchanan County
- County Seat:
- Yes
- Area (mi²):
- 4.986
- State:
- Virginia
Grundy is a town located in Buchanan County, Virginia. Grundy has a 2026 population of 820. It is also the county seat of Buchanan County. Grundy is currently declining at a rate of -1.8% annually and its population has decreased by -7.45% since the most recent census, which recorded a population of 886 in 2020.