The malacological inventory conducted in the Gharb Plain aims to explore the diversity and distribution of terrestrial and freshwater mollusks in the region. This study is part of a broader effort to better understand local biodiversity and the impact of human activities on ecosystems. The results reveal a rich malacological diversity, with 22 species of gastropods and 8 species of bivalves, which represent more than two-thirds of the total species in these two groups across Morocco. Additionally, the Family Planorbidae is the most abundant in the gastropod group, while the Family Sphaeridae is most represented among the bivalves. This inventory underscores the Gharb Plain's significance as a key reservoir of malacological biodiversity.