Megalovalvata baicalensis is a species of freshwater snail with an operculum, an aquatic gastropod mollusc in the family Valvatidae, the valve snails.
This species occurs in lake Baikal in depths from 3 to 50 m, and in the Angara River in Russia.
The type locality is Lake Baikal ("Baikalsee").
This snail lives in freshwater habitats.