Saudi Aramco (Arabic: أرامكو السعودية ʾArāmkū as-Suʿūdiyyah), officially the Saudi Arabian Oil Group (formerly Arabian-American Oil Company) or simply Aramco, is a Saudi Arabian public petroleum and natural gas company based in Dhahran. As of 2022, it is one of the largest companies in the world by revenue and has repeatedly achieved the largest annual profits in global corporate history. Saudi Aramco has both the world's second-largest proven crude oil reserves, at more than 270 billion barrels (43 billion cubic metres), and largest daily oil production of all oil-producing companies.

Saudi Aramco operates the world's largest single hydrocarbon network, the Master Gas System. In 2013 crude oil production total was 3.4 billion barrels (540 million cubic metres), and it manages over one hundred oil and gas fields in Saudi Arabia, including 288.4 trillion standard cubic feet (scf) of natural gas reserves. Along the Eastern Province, Saudi Aramco most notably operates the Ghawar Field (the world's largest onshore oil field) and the Safaniya Field (the world's largest offshore oil field).

On 18 December 2019, the company's shares commenced trading on the Tadawul stock exchange. The shares rose to 35.2 Saudi riyals, giving it a market capitalisation of about US$1.88 trillion, and surpassed the US$2 trillion mark on the second day of trading. In the 2022 Forbes Global 2000, Saudi Aramco was ranked as the 3rd-largest public company in the world.