Lymnaea is a genus of small to large-sized air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the subfamily Lymnaeinae of the family Lymnaeidae, the pond snails.

Some species are used in aquaculture under the name Melantho snails.

Numerous Lymnaea species serve as intermediate hosts for trematodes.

Lymnaea is the type genus of the family Lymnaeidae.

Species within the genus Lymnaea include: