The black grouper (Mycteroperca bonaci), also called black rockfish or marbled rockfish, is a species of marine ray-finned fish, a grouper from the subfamily Epinephelinae which is part of the family Serranidae, which also includes the anthias and sea basses.
Other fish are sometimes called the black grouper, including the similar gag grouper, the misty grouper, and the critically endangered Warsaw grouper. This species is found in the western Atlantic Ocean from the northeastern United States to Brazil.