Arratia-Nerbioi (Spanish: Arratia-Nervión) is a comarca of the province of Biscay, in the Basque Country, Spain.

It is one of the seven eskualdeak or comarcas that compose the province of Biscay.

Arratia-Nerbioi is located on the south of the province of Biscay.

It limits with the region of Greater Bilbao on the north and Durangaldea on the northeast.

This article about a location in the Basque Country, Spain, is a stub.