The Great Nicobar serpent eagle (Spilornis klossi), also known as the South Nicobar serpent eagle, is a species of bird of prey in the Accipitridae family. It is endemic to forests on the Indian island of Great Nicobar. It is threatened by habitat loss. All major authorities now treat it as a species, but in the past it was sometimes considered a subspecies of Spilornis minimus. Today minimus is either considered a subspecies of the crested serpent eagle or a monotypic species from the central Nicobar Islands; the Central Nicobar serpent eagle.