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ABSTRACT   Molluscan fauna diversity of Pak Nam Pran mangrove forest, Pranburi District, Prachuap Khiri Khan Province were evaluated by quadrat sampling technique from May to July 2013. Live specimens were collected from 8 stations by hand-picking method. There are at least 40 molluscan species, of which they consisted of 28 species distributed in 12 families of the class Gastropoda and 12 species in 9 families of the class Bivalvia. The highest number of molluscan species recorded during the studied period was in the fishing pier area adjacent mangroves (station 7) and the residential community area adjacent mangroves (station 8) both with 18 species, followed by the dense mangrove area (station 3) with 17 species. In contrast, the lowest number of species was in the new mangrove area (station 6) with 11 species. The dense mangrove area and the fishing pier area adjacent the mangroves harbored the largest number of gastropods (14 species), while the residential community area adjacent mangroves provided the greatest number of bivalves (7 species). The dominant species of gastropods in term of spatial distribution were Cerithideopsill cingulata (Gmelin, 1791), Cerithideopsilla djadjariensis (K. Martin, 1899), Cerithideopsilla microptera (Kiener, 1842), Cerithidea quoyii (Hombron & Jacquinot, 1848), Cassidula aurisfelis (Bruguiere, 1789), and Ellobium aurisjudae (Linnaeus, 1758) while Estellacar olivacea (Reeve, 1844) and Saccostrea cf. cucullata (Born, 1788) were the dominant species of bivalves.  Keywords: diversity, mangrove, Gastropods, Bivalves, Pak Nam Pran