| Big Rock | |
| Pushpin Map: | Virginia#USA |
| Pushpin Map Caption: | Location within the Commonwealth of Virginia |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Virginia |
| Subdivision Type2: | County |
| Subdivision Name2: | Buchanan |
| Unit Pref: | Imperial |
| Population As Of: | 2020 |
| Population Total: | 199 |
| Population Density Km2: | auto |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Coordinates: | 37.3531°N -82.1889°W |
| Postal Code Type: | ZIP codes |
| Blank Name: | FIPS code |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 1495268 |
Big Rock is an unincorporated community and census-designated place (CDP) in Buchanan County, Virginia located at the convergence of County Route 650 and U.S. Route 460, a short distance from the Kentucky state line. It was first listed as a CDP in the 2020 census with a population of 199.[1]
A post office was established at Big Rock in 1854.[2] The boulder from which the community likely took its name was destroyed in the 1930s by the building of the railroad.[3]