Chiyoda Corporation (千代田化工建設株式会社, Chiyoda Kakō Kensetsu Kabushiki-kaisha) is a global engineering company specialized in oil and gas midstream for gas processing and LNG, downstream refinery and petrochemicals facilities design and construction.

[citation needed] The majority of Chiyoda's business takes place outside Japan, including the United States, Canada, Latin America, Middle East, African countries, Russia, FSU, South East Asia and Australia.

[citation needed] Chiyoda was established as part of Mitsubishi Oil in 1948, and was spun off from its parent and went public in 1957.

[3] In the late 1960s it built the Jeddah and Riyadh refineries in Saudi Arabia;[4] at present its large projects include LNG plants in Qatar, the Sakhalin-II project in eastern Russia, and a variety of specialist-chemical and pharmaceutical plants in Japan itself.

Chiyoda now engages in numerous Engineering, Procurement and Construction (EPC) and other type of projects around the world.