小鬘螺（学名：Casmaria erinaceus），是异足目唐冠螺科小鬘螺属的一种。主要分布于印度尼西亚、中国大陆、**，常栖息在潮下带。

Casmaria erinaceus, common name : the common bonnet, is a species of large sea snail, a marine gastropod mollusk in the family Cassidae, the helmet snails and bonnet snails.