Peristedion greyae, the alligator searobin, alligator armored searobin or prickly armoured sea robin, is a species of marine ray-finned fish belonging to the family Peristediidae, the armoured gurnards or armored sea robins.

Peristedion greyae was first formally described in 1967 by the American ichthyologist George C. Miller with its type locality given as the western Atlantic Ocean, off the southeastern United States at 29°40'N, 80°11'W at a depth of 165 m (541 ft).

[2] The specific name honors Marion Griswold Grey and ichthyologist at the Field Museum of Natural History, recognising her study on bathypelagic and benthic fishes.

The head has a serrated and ridged bont edge with a clear concave part at the preoperculum and this ends in a flat triangle.

[5] Peristidion greyae is found in the western Atlantic Ocean where it occurs from Virginia south through the Gulf of Mexico and Caribbean Sea to Turiaçu in northeastern Brazil.