Peronia is a genus of air-breathing sea slugs, a shell-less marine pulmonate gastropod mollusks in the family Onchidiidae.

[1] These slugs differ from other onchidiid slugs in having branched "gills" on their dorsal side, although these can be retracted.

[2] More than two dozen species of Peronia have been described from the Indo-West Pacific, but a recent revision of the genus determined that 21 of these names are synonyms.

[2] Nine species of Peronia are recognized, most of which can differentiated only by examining their internal anatomy or with DNA sequencing.

This Onchidiidae-related article is a stub.