Atxondo (Spanish: Achondo) is a municipality located in the province of Biscay, in the Basque Country, Spain. Atxondo is part of the comarca of Durangaldea and has a population of 1.447 inhabitants as of 2007 according to the Spanish National Statistics Institute.Atxondo was formed by the fusion of the former municipalities of the elizates of Apatamonasterio, Arrazola and Axpe in 1962.