The black siskin (Spinus atratus) is a species of finch in the family Fringillidae.

When stationary they are easily distinguished, but in flight the black siskin displays various patches of yellow plumage on its rump and on the wings which enhances the similarity.

[3] Its range extends from central Peru and northern Chile to western Argentina.

It is often seen in pairs or in small flocks, sometimes with other species of finch, and generally forages on the ground or in low bushes.

[3] S. atratus has a wide range and is a fairly common species, but is patchily distributed.