The alien terrestrial mollusc fauna of South Africa is comprehensively reviewed in The Introduced Terrestrial Mollusca of South Africa. A total of 34 species are considered to have been introduced to the country, of which 28 are considered established and 13 of these invasive. The history of introduction and recording is summarised and patterns of introduction are analysed. Each species is discussed in terms of its distinguishing features, habitat preferences, date of introduction and first record, native range and global distribution, distribution in South Africa, pest status, and similarity with indigenous species. Further taxonomic notes and biological observations relating to behaviour, reproduction and parasite transmission are included where relevant. In addition, some consideration is given to potentially pestiferous species, which are not yet known to occur in South Africa, but which represent a significant future introduction risk of levelling off.