| Official Name: | Long Hollow, South Dakota |
| Pushpin Map: | South Dakota#USA |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Roberts |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 37.69 |
| Area Land Km2: | 37.38 |
| Area Water Km2: | 0.31 |
| Area Total Sq Mi: | 14.55 |
| Area Land Sq Mi: | 14.43 |
| Area Water Sq Mi: | 0.12 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Total: | 265 |
| Population Density Km2: | 7.09 |
| Population Density Sq Mi: | 18.36 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1696 |
| Coordinates: | 45.6822°N -97.1611°W |
| Area Code: | 605 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 2584559 |
Long Hollow is an unincorporated community and census-designated place in Roberts County, South Dakota, United States. Its population was 265 as of the 2020 census.[3]
According to the U.S. Census Bureau, the community has an area of ; of its area is land, and is water.[4]