船蛆（学名：Teredo navalis），是海螂目蛀船蛤科Teredo的一种。主要分布于韩国、中国，常栖息在温带及热带，尤以温带数量最多。

Teredo navalis, the naval shipworm, is a species of saltwater clam, a marine bivalve mollusc in the family Teredinidae, the shipworms. This species is the type species of the genus Teredo. Like other species in this family, this bivalve is called a shipworm, because it resembles a worm in general appearance, while at the anterior end it has a small shell of two valves which is specialised to bore through wood.