Mactra glauca is a species of saltwater clam, a marine bivalve mollusc in the family Mactridae, the trough shells.

Mactra glauca has a broadly triangular, thin, glossy shell up to 115mm in length.

[3] Right and left valve of the same specimen: Mactra glauca is found on the continental shelf,[2] from the south of England to the Mediterranean[3] and West Africa.

Mactra glauca is a suspension feeder which feeds on phytoplankton.

It burrows into clean sand, going down up to 7 cm if exposed by the tide.