Trucios-Turtzioz (Turtzioz in Basque; Trucios in Spanish; Trucíos in Cantabrian) is a town and municipality located in the province of Biscay, in the Autonomous Community of Basque Country, northern Spain, surrounded by other municipalities of Biscay and Cantabria.

The name comes from a cold water spring, which existed, or still exists, in the center of the town.

In Basque, Iturriotz means "cold spring".

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