Berriz (in Basque and officially, in Spanish: Bérriz) is an elizate, town and municipality located in the province of Biscay, in the Basque Country, northern Spain.

Berriz is part of the comarca of Durangaldea and has a population of 4.623 inhabitants as of 2019 and according to the Spanish National Statistics Institute.

Berriz belongs to a series of Basque toponyms with an -iz ending.

Caro Baroja considered that on toponymy, the suffixes -oz, -ez and -iz used to be combined with the name of the owner of the lands, with its origin being in some place between the Middle Ages and the Roman Empire.

In the case of Berriz, Caro Baroja suggested that the name might come from Verrius, the documented Latin name.