Pteraster militaris, the wrinkled star, is a species of starfish in the family Pterasteridae.

Pteraster militaris is a robust starfish with a wide disc, a large central pore and five short, wrinkled, triangular arms.

The aboral (upper) surface is dotted with papulae, each topped with four short spines and above this is a papery covering giving the starfish an inflated, bulky appearance.

It grows to a diameter of 85 millimetres (3.3 in) and is usually orange, pale yellow or white, sometimes with red tips to its arms.

About forty fertilised eggs are retained in the water-filled chamber below its papery outer skin and these develop into juveniles that may reach 1 cm (0.4 in) across before they make their way out through the central pore.