Ogoy (Russian: Ого́й from Buryat: Уһагγй - waterless) is the largest island in the Maloe More strait of Lake Baikal.

It is located between the Cape Shara-Shulun on the west coast of the Olkhon Island and Kurminskiy Bay on the western shore of Lake Baikal.

Vegetation on the island is scarce, mainly grasses and low-growing shrubs, with a few larches in the wide central region.

In summer, excursions on the boats are organized and in winter, via automobile transport by ice.

According to representatives of the Siberian Institute of Physiology and Biochemistry of Plants, the increase of tourist flow can be detrimental to flora and fauna of the island.