| Official Name: | Sigma, Virginia |
| Settlement Type: | Unincorporated community |
| Pushpin Map: | Virginia#USA |
| Pushpin Label: | Sigma |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Virginia |
| Subdivision Type2: | County |
| Subdivision Name2: | Lee |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 1988 |
| Coordinates: | 36.83°N -82.9367°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1496225 |
Sigma is an unincorporated community in Lee County, Virginia, United States.