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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Order: | Anseriformes |
| Family: | Anatidae |
| Genus: | Cygnus |
| Species: | melanocoryphus |
The Black-necked Swan (Cygnus melanocoryphus) is a member of the duck, goose and swan family Anatidae. It is a waterbird of South America.
This swan breeds in Patagonia, Tierra del Fuego and on the Falkland Islands. In winter, this bird migrates northwards to Paraguay and southern Brazil.