| Official Name: | Brant Lake, South Dakota |
| Settlement Type: | City |
| Pushpin Map: | South Dakota#USA |
| Pushpin Label: | Brant Lake |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Lake |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.40 |
| Area Land Km2: | 0.40 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.15 |
| Area Land Sq Mi: | 0.15 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 56 |
| Population Density Km2: | 139.71 |
| Population Density Sq Mi: | 361.29 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1604 |
| Coordinates: | 43.9308°N -96.9436°W |
| Area Code: | 605 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 2785127 |
Brant Lake is a city in Lake County, South Dakota, United States.[2] [3] Its population was 56 as of the 2020 census.[4] It was counted as a census-designated place prior to the 2020 census, as it had not yet incorporated. The town's residents voted to incorporate in a 61–9 vote on March 29, 2016.[5]