The oriole blackbird (Gymnomystax mexicanus) is a species of bird in the family Icteridae. Its genus, Gymnomystax, is monotypic. It is a medium-sized yellow and black bird found in Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, and Venezuela, where its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist shrubland, subtropical or tropical seasonally wet or flooded lowland grassland, and swamps.