| Khadzhyder Lagoon | |
| Caption Map: | The Kurudiol Lagoon on the schematic map of the Tuzly Lagoons (#8) |
| Pushpin Map: | Ukraine Odesa Oblast |
| Pushpin Map Alt: | Location of lagoon in the Black Sea |
| Location: | Black Sea |
| Coords: | 45.8667°N 87°W |
| Rivers: | Khadzhyder River, Hlyboka River |
| Oceans: | Atlantic Ocean |
| Countries: | Ukraine |
| Length: | 4km (02miles) |
| Width: | 2.5km (01.6miles) |
Khadzhyder Lagoon (Хаджидер, Romanian; Moldavian; Moldovan: Lacul Hagider) is a salty lagoon in the Tuzly Lagoons group in Bilhorod-Dnistrovskyi Raion of Odesa Oblast, Ukraine. It is separated from the Alibey by a sandbar. Two river, Khadzhyder River and Hlyboka River, inflow into the lagoon. The last one inflows west to the village Bezymyanka, it has a length 24 km, watershed area 80.3 km2. The lagoon has a 4 km length and 2.5 km width. Two villages, Lyman and Bezymyanka, are located on the coast of the lagoon.
The lagoon was a part of the Alibey Lagoon in historical period, and appeared as a result of separation of the Khadzhyder River mouth by a sandbar. Several kurhans of Catacomb culture are located near the village of Lyman.
The water body is included to the Tuzly Lagoons National Nature Park.
The name of the lagoon Khadzhyder on the historical maps: