Meretrix lamarckii, also called Korean clam or Korean hard clam, is a species of saltwater bivalve in the family Veneridae.

[1] It is the second species of venerid clam where doubly uniparental inheritance (DUI) has been identified.

[2] It is a medium-sized clam which lives in sandy sediments from the subtidal zone to a depth of 20 meters.

[3] In the waters off Hyūga, Miyazaki, it spawns between late July and early September.

[4] M. lamarckii is edible and economically important in China; commercial fishing has greatly disrupted the habitat where it lives.