PETRONAS, short for Petroliam Nasional Berhad (National Petroleum Limited), is a Malaysian oil and gas company that was founded in 1974. Wholly owned by the Government of Malaysia, the corporation is vested with the entire oil and gas resources in Malaysia and is entrusted with the responsibility of developing and adding value to these resources. PETRONAS is ranked among Fortune Global 500's largest corporations in the world. Fortune ranks PETRONAS as the 158th largest company in the world in 2019.

Since its incorporation, PETRONAS has grown to be an integrated international oil and gas company with business interests in 35 countries. As of the end of March 2005, the PETRONAS Group comprised 103 wholly owned subsidiaries, 19 partly owned outfits and 57 associated companies. Together, these companies make the PETRONAS Group, which is involved in various oil and gas based activities.