The Kolyma Bay (Russian: Колымская Губа; Kolymskaya Guba) is one of the main gulfs of the East Siberian Sea.

The sea in this bay is frozen for over nine months every year and is often clogged with ice floes.

Kolesovsky Island and Kolesovskaya Otmel are located close to the shore in the central part of the Kolyma Bay.

The Sundrun River has its mouth at the northwestern limit of the bay.

Administratively the Kolyma Bay belongs to the Sakha Republic (Yakutia) of the Russian Federation.