Mangrove forests are a group of plants that have the same morphological and physiological adaptations to habitats affected by tides. This study aims to find out the richness and density of gastropods in the Cilacap Mangrove Forest. The method used in this study is the Cluster Sampling method.  The results showed that the gastropods found in the Tritih Cilacap Mangrove Forest consisted of 11 species from 8 families. The highest wealth at station one found 8 species, stations two, three, and four found 6 species while at station five found only 5 species. The highest density was found at station five at 33.36 ind/m² while the lowest density was found at station one at 6.8 ind/m².