| Official Name: | Long Lost Lake Township |
| Settlement Type: | Township |
| Pushpin Map: | Minnesota |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location within the state of Minnesota |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Minnesota |
| Subdivision Type2: | County |
| Subdivision Name2: | Clearwater |
| Established Title: | Organized |
| Established Date: | 2005 |
| Unit Pref: | Imperial |
| Population As Of: | 2010 |
| Population Total: | 43 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Coordinates: | 47.2°N -114°W |
| Blank Name: | FIPS code |
| Blank Info: | 27-38042[1] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2392573[2] |
Long Lost Lake Township is a township in Clearwater County, Minnesota, United States. The population was 43 at the 2010 census. The township was organized in 2005, having previously existed as a survey township and unorganized territory.[2]