China National Offshore Oil Corporation (CNOOC) is a state-owned energy company based in Beijing, founded in 1982. It is the largest offshore oil and gas producer in China and operates in over 40 countries. CNOOC has a comprehensive industrial chain that includes oil and gas exploration, development, refining, and marketing, as well as natural gas infrastructure and power generation.

The company focuses on various business segments, including upstream oil and gas production, engineering and technical services, and financial services related to the energy sector. CNOOC is recognized for its significant contributions to the energy market, serving a diverse range of customers from domestic consumers to international markets. With a strong emphasis on expanding its global presence, CNOOC continues to diversify its energy portfolio beyond traditional offshore production.