| Lac-des-Eaux-Mortes | |
| Settlement Type: | Unorganized Territory |
| Pushpin Map: | Canada Eastern Quebec |
| Pushpin Map Caption: | Location in eastern Quebec. |
| Coordinates: | 48.2333°N -73°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Province |
| Subdivision Type2: | Region |
| Subdivision Name2: | Bas-Saint-Laurent |
| Subdivision Type3: | RCM |
| Subdivision Name3: | La Mitis |
| Established Title1: | Established |
| Established Date1: | March 13, 1986 |
| Leader Title1: | |
| Leader Name1: | Haute-Gaspésie—La Mitis—Matane—Matapédia |
| Leader Title2: | Prov. riding |
| Leader Name2: | Matane-Matapédia |
| Area Total Km2: | 954.82 |
| Area Land Km2: | 923.26 |
| Population Total: | 47 |
| Population As Of: | 2021 |
| Population Density Km2: | 0.1 |
| Population Blank1 Title: | Pop 2026-2021 |
| Population Blank1: | N/A |
| Population Blank2 Title: | Dwellings |
| Population Blank2: | 202 |
| Timezone: | EST |
| Utc Offset: | −5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | −4 |
| Blank Name: | Highways |
| Blank Info: | No major routes |
Lac-des-Eaux-Mortes (in French pronounced as /lak de.z‿o mɔʁt/, literally Lake of the dead Waters) is an unorganized territory in the Canadian province of Quebec, located in the La Mitis Regional County Municipality.