紫贻贝（Blue mussel，学名紫壳菜蛤(Mytilus e****s)，俗称蓝青口，是贻贝目壳菜蛤科壳菜蛤属的一种。

主要分布于中国、欧洲北海、美国北大西洋、澳大利亚等海域，常栖息在低潮区至浅海水域。

The blue mussel (Mytilus e****s), also known as the common mussel, is a medium-sized edible marine bivalve mollusc in the family Mytilidae, the mussels. Blue mussels are subject to commercial use and intensive aquaculture.