The Omulyakh Bay (Russian: Омуляхская губа; Yakut: Уомуллаах тамах) is a bay of the East Siberian Sea in the Sakha Republic (Yakutia), Russian Federation.

Omulyakh Bay is open to the east through a narrow and straight channel and is 115 km in length.

Starting from its mouth the bay widens inside, until it reaches a width of 25 km (16 mi).

The bay is in an area of wetlands; lakes and marshes dot the whole landscape.

Owing to is northerly location the Omullyakh Bay is covered with ice most of the year.