List of non-marine molluscs of Great Britain

This list comprises 220 species of non-marine molluscs that have been recorded in the scientific literature as part of the fauna of the island of Great Britain. These are terrestrial and aquatic gastropods, and aquatic bivalves; the list does not include species of molluscs which are considered to be fully marine, except for two marine pulmonate gastropods.

In other words: this list includes land snails and slugs, and freshwater and brackish water snails. It also includes freshwater mussels and clams, including some that can tolerate brackish water. Molluscs that are fully adapted to live in the sea are not included here, except for two species that are air-breathing and thus are more closely related to most land and freshwater snails than they are to the majority of sea snails.

Great Britain is a European island in the northeastern Atlantic, comprising the contiguous countries of England, Scotland and Wales. (Great Britain is not the same entity as the United Kingdom of Great Britain and Northern Ireland, for more information on the complex nomenclature of this area, please see terminology of the British Isles.)

The mollusc fauna of the island of Ireland, which includes both the Republic of Ireland and Northern Ireland, is listed in another article: List of non-marine molluscs of Ireland.

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