The National Iranian Oil Company (NIOC) is Iran's state-owned oil and gas company, established in 1951 after the nationalization of the Iranian oil industry. Headquartered in Tehran, NIOC is one of the largest oil companies in the world and operates under the supervision of the Iranian government. It plays a vital role in the country's economy and is responsible for the entire upstream oil and gas sector, including exploration, drilling, production, and development of resources.

NIOC conducts geological studies and manages production from both onshore and offshore oil fields, primarily in the southwestern Khuzestan region and the Persian Gulf. The company produces crude oil, natural gas, and refined petroleum products, and it oversees subsidiaries involved in various aspects of the oil and gas industry, including procurement and drilling services. NIOC supplies crude oil and gas for domestic use and exports to international markets, primarily targeting Asia and Europe.