Spinus is a genus of passerine birds in the finch family. It contains the North and South American siskins and goldfinches, as well as two Old World species. The genus name is from the Ancient Greek σπίνος spínos, a name for a now-unidentifiable bird.
The American goldfinch is a small North American bird in the finch family. It is migratory, ranging from mid-Alberta to North Carolina during the breeding season, and from just south of the Canada–United States border to Mexico during the winter.

The Andean siskin is a species of finch in the family Fringillidae. It is found in Colombia, Ecuador, and Venezuela. Its natural habitats are subtropical or tropical moist montane forests, subtropical or tropical high-altitude shrubland, subtropical or tropical high-altitude grassland, and heavily degraded former forest.

The Antillean siskin is a species of finch in the family Fringillidae, and the only species of the genus Spinus found in the Caribbean.

The black siskin is a species of finch in the family Fringillidae. It is found in Argentina, Bolivia, Chile, and Peru. Its natural habitats are subtropical or tropical high-altitude shrubland and subtropical or tropical high-altitude grassland.

The black-capped siskin is a species of finch in the family Fringillidae. It is found in Mexico and Guatemala. Its natural habitats are subtropical or tropical moist montane forest and heavily degraded former forest.

The black-chinned siskin is a species of finch in the family Fringillidae. Found in Argentina, Chile and the Falkland Islands, its natural habitats are temperate forests and heavily degraded former forest.

The black-headed siskin, also known as the Jonny Bee, is a species of finch in the family Fringillidae. It is found in Mexico, Belize, El Salvador, Guatemala, Honduras, and Nicaragua. Its natural habitats are subtropical or tropical moist montane forest and heavily degraded former forest.

The Eurasian siskin is a small passerine bird in the finch family Fringillidae. It is also called the European siskin, common siskin or just siskin. Other (archaic) names include black-headed goldfinch, barley bird and aberdevine. It is very common throughout Europe and Eurosiberia. It is found in forested areas, both coniferous and mixed woodland where it feeds on seeds of all kinds, especially of alder and conifers.

The hooded siskin is a small passerine bird in the finch family (Fringillidae), native to South America. It belongs to the putative clade of neotropical siskins in the genus Spinus sensu lato.

Lawrence's goldfinch is a small songbird of erratic distribution that breeds in California and Baja California and winters in the southwestern United States and northern Mexico.

The lesser goldfinch is a very small songbird of the Americas. Together with its relatives the American goldfinch and Lawrence's goldfinch, it forms the American goldfinches clade in the genus Spinus sensu stricto.

The olivaceous siskin is a species of finch in the family Fringillidae. It is found in Bolivia, Ecuador, and Peru, where its natural habitats are subtropical or tropical moist montane forests and heavily degraded former forest.

The pine siskin is a North American bird in the finch family. It is a migratory bird with an extremely sporadic winter range.

The red siskin is a small endangered finch native to tropical South America - in northern Colombia, northern Venezuela and Guyana. It was common in the early 20th century, occurring throughout the foothills of northern Venezuela, but has now become extremely rare in a fragmented range. The population on Trinidad is believed to be extirpated, with no sightings since 1960.

The saffron siskin is a species of finch in the family Fringillidae. It is found in Ecuador and Peru. Its natural habitats are subtropical or tropical dry forests, subtropical or tropical dry shrubland, and urban areas. It is threatened by habitat destruction and the IUCN has assessed it as being a "least concern species".

The Tibetan serin or Tibetan siskin is a true finch species.

The yellow-bellied siskin is a small passerine bird in the finch family Fringillidae. It breeds from Costa Rica south to southern Ecuador, central Bolivia and the highlands of northwestern Venezuela.
The yellow-faced siskin is a species of finch in the family Fringillidae. It is found in Brazil and Venezuela.

The yellow-rumped siskin is a species of finch in the family Fringillidae. It is found in Argentina, Bolivia, Chile, and Peru. Its natural habitats are subtropical or tropical moist montane forests and subtropical or tropical high-altitude shrubland.