Acciona, S.A. (Spanish pronunciation: [akˈθjona]) is a Spanish conglomerate group dedicated to the development and management of infrastructure (construction, water, industrial and services) and renewable energy.

The company was founded in 1997 through the merger of Entrecanales y Tavora and Cubiertas y MZOV. The company's headquarters is in Alcobendas, Community of Madrid, Spain. The company's U.S. operations are headquartered in Chicago, Illinois.

The Company employs 30,000 professionals, and it is to be found in 30 countries on five continents. The Company is IBEX 35-listed and an industry benchmark.