Arrieta (both in Basque and Spanish) is a town and municipality located in the province of Biscay, in the Basque Country, Spain. Arrieta is part of the comarca of Mungialdea. It had a population of 552 inhabitants as of 2007, and a population of 564 inhabitants as of 2017.

This municipality has its origin in the elizate Líbano de Arrieta, which became a municipality in the 19th century. The toponym Arrieta comes from the Basque word harrieta, which means "stony place".