There are two species of Gorilla: Gorilla gorilla(Western Gorilla) and Gorilla beringei (Eastern Gorilla). There are four recognized subspecies:
Western Lowlands Gorilla (Gorilla gorilla gorilla)
Cross River Gorilla (Gorilla gorilla diehli)
Mountain Gorilla (Gorilla beringei beringei)
Eastern Lowland Gorilla (Gorilla beringei graueri)
The Bwindi Gorilla has been suggested as a third subspecies of Easter Gorilla. However, it has not yet been assigned a trinomen.