Urduliz (Spanish: Urdúliz) is a municipality located in northern Biscay, Spain. While connected to Greater Bilbao both by the Bilbao metro and BizkaiBus, the municipality is part of Mungialdea. The municipality shows a mixture of industrial and rural qualities, being divided in three separate villages or neighbourhoods. According to the 2019 census, it has 4,456 inhabitants.