This book presents a state-of-the-art overview on the terrestrial malacofauna of Türkiye. It compiles the knowledge on Turkish landsnails accumulated by a multifold of scientists since Linnaeus as per end 2023. It covers 734 taxa at (sub)species level, distributed over 188 genera belonging to 43 families. 65 % of the terrestrial snails are endemic to the country. Over 2,600 colour photos illustrate all shelled gastropods, many of them are represented by their type specimens. Anatomical drawings of all slug species are incorporated in the text. In addition, 121 highly detailed distribution maps based on 3,300 localities are supplied. The reference list contains more than 2,700 entries, not only on Türkiye but covers large parts of the Near and Middle East. The book aims to serve as a basis for identifying Türkiye's terrestrial malacodiversity, recognizing structural changes and taking appropriate measures for nature and habitat conservation.