Donax cuneatus, the cradle donax or cuneate wedge shell, is a species of small saltwater clam, a marine bivalve mollusc species in the family Donacidae.

This species is reported from the Seychelles, Sri Lanka, India, Malaysia, Vietnam, Indonesia, China, the Philippines, Australia, New Caledonia, Fiji, and Vanuatu.

[2] The shells are shiny grayish white, with brownish or purple bands radiating from the umbos.

[3]   In the interior of the shell, the exceptionally large pallial sinus[4] is indicative of the long siphons of bivalves that dig themselves deep into sand or mud substrates.

[6] In some areas Donax cuneatus is harvested by indigenous people as a minor subsistence food.