Ophidiaster granifer, the grained seastar, is a species of starfish in the family Ophidiasteridae.

Ophidiaster granifer is a small five armed starfish with a cryptic mottled brown colouration.

In this species, eggs are liberated into the sea in a synchronous spawning event but no fertilisation takes place.

[4] Ophidiaster granifer is found on coral reefs in shallow waters in the Red Sea and Indo-Pacific Ocean.

It is known from the South China Sea, Japan, Tonga, Fiji, Samoa, northern and western Australia, the Great Barrier Reef, New Guinea, Indonesia, the East Indies and the Philippines.