Lethrinus is a genus of marine ray-finned fishes belonging to the family Lethrinidae, the emperors and emperor breams. These fishes are mostly found in the Indian and western Pacific Oceans, with a single species in the eastern Atlantic Ocean.

Lethrinidae are a family of ray-finned fishes belonging to the order Spariformes commonly known as emperors, emperor breams, and pigface breams.