Bechtel Corporation, commonly referred to as Bechtel Group, is an American engineering, procurement, construction (EPC), and project management company founded in 1898 in San Francisco, California, by Warren A. Bechtel. Initially operating as a construction firm in the western United States, it was formally incorporated in 1925 and quickly became the largest construction company in the region. It has grown into one of the world's largest privately held engineering and construction firms, specializing in large-scale infrastructure projects across energy, transportation, telecommunications, mining, defense, and environmental sectors. The company operates in over 160 countries, delivering complex projects such as power plants, oil and gas facilities, pipelines, airports, rail systems, and nuclear facilities.

Bechtel gained prominence through major projects such as the Hoover Dam in the 1930s, where Warren Bechtel served as president of the constructing consortium, as well as the San Francisco–Oakland Bay Bridge, the Alaska oil pipeline, the Channel Tunnel, and extensive infrastructure developments worldwide, including in the Middle East. The company has a history of reshaping global landscapes through ambitious engineering feats, emphasizing innovation in sustainable engineering and project delivery.

Headquartered in Reston, Virginia, in the Washington metropolitan area, Bechtel operates as a global firm with over 50,000 employees as of May 2025. As of 2022, it was ranked by Engineering News-Record (ENR) as the second-largest construction company in the United States, following Turner Construction, based on revenue and project scale. The firm maintains a private, family-controlled structure with deep ties to government contracts, particularly with the U.S. Department of Defense and Department of Energy, ensuring long-term strategic focus. Leadership has passed through successive generations of the Bechtel family, including Stephen D. Bechtel, who served as president from 1936 to 1960, solidifying its reputation as one of the world's premier engineering enterprises.

Bechtel's influence extends to policy and international relations through its advisory roles and partnerships with governments, underscoring its position in networks of global economic and political power. The company has faced controversies, including allegations of cost overruns and environmental impacts in projects like the Iraq oil infrastructure reconstruction in the early 2000s, where it was awarded no-bid contracts amid criticism for inefficiency and political favoritism. Despite such challenges, Bechtel continues to secure major contracts and contribute significantly to global infrastructure development.