Arrigorriaga is a town and municipality located in the province of Bizkaia, in the autonomous community of Basque Country, northern Spain. Arrigorriaga is located 7 km south of Bilbao and is part of Bilbao's metropolitan area. Its official population at the 2019 census was 12,160 inhabitants living on a land area of 16.36 square kilometres (6.32 sq mi).

Bilbao is a city in northern Spain, the largest city in the province of Biscay and in the Basque Country as a whole. It is also the largest city proper in northern Spain. Bilbao is the tenth largest city in Spain, with a population of more than 347,000 as of 2023. The Bilbao metropolitan area has 1,037,847 inhabitants, making it the most populous metropolitan area in northern Spain; with a population of 875,552, the comarca of Greater Bilbao is the fifth-largest urban area in Spain. Bilbao is also the main urban area in what is defined as the Greater Basque region.