Altos Hornos de Vizcaya, S.A. was a Spanish metallurgy manufacturing company.

The location was chosen for the iron mineral resources around Bilbao, the proximity to a sea port, and the metallurgical tradition of the area.

After the Spanish Civil War, the industry of Basque Country was left basically intact.

The business was thus one of the major forces responsible for the economic development of many of the municipalities of Biscay, including Barakaldo, Sestao, Portugalete, Ortuella, and Abanto y Ciérvana.

As a consequence of the implementation of the "Plan de Competitividad Conjunto AHV - Ensidesa", in December 1994 the CSI Group (Corporación Siderúrgica Integral) was formed, and it in turn was reorganized in 1997 forming the Aceralia Iron and Steel Corporation.