Onchidiidae are a family of small, air-breathing sea (and land) slugs. They are shell-less marine (except of 5 species) pulmonate gastropod molluscs. Onchidiidae is the only family within the superfamily Onchidioidea.

Onchidiidae are a family of small, air-breathing sea (and land) slugs. They are shell-less marine (except of 5 species) pulmonate gastropod molluscs. Onchidiidae is the only family within the superfamily Onchidioidea.