| Omoloy | |
| Other Name: | Омолой |
| Map: | Siberia omoloy.png |
| Source1: | Sietinden Range |
| Source1 Coordinates: | 68.1217°N 130.5422°W |
| Source1 Elevation: | 1100m (3,600feet) |
| Mouth: | Laptev Sea |
| Mouth Location: | Buor-Khaya Gulf |
| Mouth Coordinates: | 71.2311°N 131.9919°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 593km (368miles) |
| Basin Size: | 38900km2 |
| Pushpin Map: | Russia Sakha Republic |
| Pushpin Map Caption: | Mouth location in Yakutia, Russia |
The Omoloy (Russian: Омолой Yakut: Омолой) is a river in Siberia, flowing into the Laptev Sea east of the river Lena. It is long, and has a drainage basin of . Administratively the basin of the Omoloy is part of the Sakha (Yakutia) administrative region of Russia.
There is a 332500ha protected area in the basin of the river.[1] The now extinct Beringian steppe bison used to have its habitat in the area of the Omoloy.[2]
It flows roughly northwards across the tundra along a valley limited by the Sietinden Range to the west and the Kular Range to the east. Both ranges are part of the Verkhoyansk Range system.The Omoloy flows through the East Siberian Lowland into the Laptev Sea. Its mouth is located in the eastern coast of the Buor-Khaya Gulf. The river freezes up in October and stays under ice until late May or early June.
The main tributaries of the Omoloy are the 279km (173miles) long Kuranakh-Yuryakh, the 190km (120miles) long Arga-Yuryakh, the 91km (57miles) long Bukhuruk (Бухурук) and the 98km (61miles) long Sietinde (Сиэтиндьэ) from its left side, as well as the 159km (99miles) long Ulakhan-Kyuegyulyur from the right.[3]