| Official Name: | Post Lake, Wisconsin |
| Settlement Type: | Census-designated place |
| Pushpin Map: | Wisconsin#USA |
| Pushpin Label: | Post Lake |
| Pushpin Label Position: | bottom |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Wisconsin |
| Subdivision Type2: | County |
| Subdivision Name2: | Langlade |
| Subdivision Type3: | Town |
| Subdivision Name3: | Elcho |
| Area Footnotes: | [1] |
| Area Total Sq Mi: | 8.874 |
| Area Land Sq Mi: | 7.248 |
| Area Water Sq Mi: | 1.626 |
| Population As Of: | 2010 |
| Population Footnotes: | [2] |
| Population Total: | 374 |
| Population Density Sq Mi: | 51.6 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1532 |
| Coordinates: | 45.4408°N -89.0803°W |
| Postal Code Type: | ZIP Code |
| Postal Code: | 54428 (Elcho) |
| Area Code: | 715 & 534 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1571820 |
| Blank1 Name: | FIPS code |
| Blank1 Info: | 55-64550 |
Post Lake is an unincorporated community and census-designated place (CDP) in the town of Elcho, Langlade County, Wisconsin, United States. Post Lake is 12miles southwest of Crandon. As of the 2010 census, its population was 374.[2] A post office was established in 1884, but it was eventually discontinued in 1913. [3]