A. nigra
# A. nigra

A. nigra may refer to:

* Actia nigra, a tachinid fly species
* Aculeola nigra, the hooktooth dogfish, a small, little known dogfish, the only member of the genus Aculeola
* Alpinia nigra, an herb in the ginger family
* Arkoola nigra, a fungus plant pathogen species
* Astrapia nigra, the Arfak Astrapia, a large black bird of paradise species
