Helicostoa is a monotypic genus of freshwater snail, an aquatic gastropod mollusc in the order Littorinimorpha containing the single species Helicostoa sinensis.

[4] According to taxonomy of the Gastropoda by Bouchet & Rocroi (2005) the family Helicostoidae has no subfamilies.

Helicostoa sinensis was previously tentatively placed within the superfamily Rissooidea.

[3] Helicostoa sinensis is only found in China,[4] more specifically in the Yangtze River.

[3] This freshwater snail lives attached or bonded to blocks of limestone.