| Karachaus Lagoon | |
| Caption Map: | The Karachaus Lagoon on the schematic map of the Tuzly Lagoons (#9) |
| Pushpin Map: | Ukraine Odesa Oblast |
| Pushpin Map Alt: | Location of lagoon in the Black Sea |
| Location: | Black Sea |
| Coords: | 45.7724°N 29.9335°W |
| Rivers: | Hlyboka River |
| Oceans: | Atlantic Ocean |
| Countries: | Ukraine |
| Area: | 7.6km2 |
Karachaus Lagoon (Ukrainian: Карачаус, Romanian; Moldavian; Moldovan: Caraceauş) is a salty lagoon in the Tuzly Lagoons group in Bilhorod-Dnistrovskyi Raion of Odesa Oblast, Ukraine. It was a part of the Alibey Lagoon in past, locating in its south-west part, near the village of Roylianka. Now it is separated from the Alibey Lagoon by the sandbar. The total area of the lagoon - 7.6 km2.
The water body is included to the Tuzly Lagoons National Nature Park.