| Official Name: | Clear Lake, South Dakota |
| Settlement Type: | Census-designated place |
| Pushpin Map: | South Dakota#USA |
| Pushpin Label: | Clear Lake |
| Coordinates: | 45.6933°N -97.3572°W |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | South Dakota |
| Subdivision Type2: | County |
| Subdivision Name2: | Marshall |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 2.80 |
| Area Land Sq Mi: | 0.98 |
| Area Water Sq Mi: | 1.82 |
| Area Total Km2: | 7.26 |
| Area Land Km2: | 2.53 |
| Area Water Km2: | 4.73 |
| Population As Of: | 2020 |
| Population Footnotes: | [2] |
| Population Density Km2: | 67.22 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1821 |
| Postal Code Type: | ZIP Code |
| Postal Code: | 57247 (Lake City) |
| Area Code: | 605 |
| Blank Name: | FIPS code |
| Blank Info: | 46-12640 |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2807114 |
| Population Total: | 170 |
| Unit Pref: | Imperial |
| Population Density Sq Mi: | 174.18 |
Clear Lake is an unincorporated community and census-designated place (CDP) in Marshall County, South Dakota, United States, surrounding a natural lake of the same name. Within the Lake Traverse Indian Reservation, it was first listed as a CDP prior to the 2020 census. The population was 170 at the 2020 census.[3]
It is in the southeast part of the county, bordered to the northeast by South Dakota Highway 10, which leads northwest 4miles to Lake City and southeast to Sisseton.