Two new species belonging to genus Nassarius are described and illustrated based on shell morphology and radular features. Nassarius sanyaensis sp. nov., collected from intertidal zone of Sanya, Hainan Island, China, most resembles Nassarius lyraeformis (Marrat, 1880) in general shell shape, but differs from the latter in having remarkable nodules on shell surface. Nassarius beibuensis sp. nov., sampled from shallow water of Beibu Gulf, is most similar to Nassarius oblongus (Marrat, 1877), but can be distinguished from it mainly in having stronger sculpture. This study expands our knowledge of Nassarius diversity and distribution in China seas. [ABSTRACT FROM AUTHOR]