Pentaceraster cumingi, sometimes known as the Panamic cushion star, Cortez starfish or knobby star (a name also used for other species), is a species of starfish in the family Oreasteridae.

It is found in warmer parts of the East Pacific (Gulf of California to northwest Peru, including offshore islands like the Galápagos) and in Hawaii.

[7] Its diet consists of ocean floor algae, microscopic organisms, and seagrass.

Asexual reproduction, which results in a clonal offspring, occurs by fission, splitting the central disc.

[7] The skeleton of this species is commonly used for ornamentation and sold as a souvenir in Peru and Mexico.