Sellyakh Bay (Russian: Селляхская губа; Yakut: Сиэллээх тамах) is a bay in Ust-Yansky District, Sakha Republic (Yakutia), Russian Federation.

[1] There are no settlements in the bay area, the nearest inhabited place is Tumat to the south.

It is located northeast of the mouths of the Chondon and southeast of the Makar and Shelonsky Islands.

The Manyko Peninsula encloses the bay to the northwest and to the north the bay is limited by a narrow spit with Cape Turuktakh at the end.

[3][4] The 352 km (219 mi) long Sellyakh[5] and the 267 km (166 mi) long Muksunuokha (Максунуоха) are the main rivers with their mouths in the bay.