Agelaius is a genus of blackbirds in the New World family Icteridae. Established by Louis Jean Pierre Vieillot in 1816, it contains five species:

The austral blackbird is a species of bird in the family Icteridae. It is found in Argentina and Chile. Its natural habitats are temperate forests, subtropical or tropical high-altitude shrubland, and heavily degraded former forest.

Brewer's blackbird is a medium-sized New World blackbird. It is named after the ornithologist Thomas Mayo Brewer.

The chopi blackbird is a species of bird in the family Icteridae. It is monotypic within the genus Gnorimopsar. It is found in Argentina, Bolivia, Brazil, Paraguay, Peru, and Uruguay. Its natural habitats are dry savanna, subtropical or tropical seasonally wet or flooded lowland grassland, pastureland, and heavily degraded former forest.

Dives is a genus of Neotropical birds in the family Icteridae.

The Jamaican blackbird is a species of bird in the New World blackbird and oriole family Icteridae. It is the only species (monotypic) in the genus Nesopsar. The species has sometimes been included in the genus Agelaius, but molecular systematics have shown it not be closely related to any living New World blackbird or grackle. The species is endemic to Jamaica, where it is restricted to Cockpit Country, some central areas and the Blue and John Crow Mountains.

The oriole blackbird 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 forest, subtropical or tropical moist shrubland, subtropical or tropical seasonally wet or flooded lowland grassland, and swamps.

The rusty blackbird is a medium-sized blackbird, closely related to grackles. It is a bird that prefers wet forested areas, breeding in the boreal forest and muskeg across northern Canada, and migrating southeast to the United States during winter.
The scarlet-headed blackbird is an icterid found in the South American wetlands.

The yellow-headed blackbird is a medium-sized blackbird, and the only member of the genus Xanthocephalus.

The yellow-shouldered blackbird, also known as la Mariquita de Puerto Rico or capitán, is a diurnal blackbird endemic to the archipelago of Puerto Rico and belongs to the genus Agelaius of the family Icteridae. It has black plumage with a prominent yellow shoulder on its wing. Adult males and females are of similar appearance. The species is predominantly insectivorous.