Stephen Hemsley Longrigg OBE (7 August 1893 – 11 September 1979) was a British military governor, petroleum company manager and a leading authority on the history of oil in the Middle East.
Longrigg was born in Sevenoaks, Kent and educated at Highgate School in London, where he won the Governors' gold medal and was later Chairman of Governors from 1954 - 1965. After winning a scholarship to study Classics at Oriel College, Oxford, where he gained a 1st in Honour Moderations, he served in the Royal Warwickshire Regiment from 1914, was twice mentioned in dispatches and then returned to Oxford from Iraq for his MA degree at the end of his military service in 1921. He then joined the British Administration in Iraq and served as Inspector-General of Revenue between 1927 and 1931. It was during this time that he wrote Four Centuries of Modern Iraq (1925), a history of Iraq under the Ottoman Empire.
In 1931, as part of a policy to replace British officials with Iraqis, Longrigg left the administration and joined the Iraq Petroleum Company (IPC). By now he was an accomplished linguist and Arabist, with a wide knowledge of tribal affairs
He joined IPC at a time when the Company was preparing to build the first pipeline system from Kirkuk to the Mediterranean. Being appointed as a Land and Liaison Officer, Longrigg's role was to organise the purchase of land for the pipeline, pumping stations, terminals and depots along the route. He also had to organise the recruitment of labour, rates of pay and conditions of employment, and to make arrangements for the security of Company personnel and property.
In 1933, before the pipeline was completed, Longrigg was sent to Jeddah to join negotiations for an oil concession for the eastern province of Saudi Arabia. He was unsuccessful in this, on account of IPC's refusal to make payments to the Saudi Arabian government in gold rather than rupees. The successful bidder, Standard Oil of California, went on to discover oil at Dammam in 1938 and in due course became known as Aramco. In 1936, he was appointed general manager of an IPC subsidiary company, Petroleum Concessions Ltd, and spent that summer in Saudi Arabia obtaining oil concessions for the provinces of Hejaz and Asir (IPC did not find oil and abandoned the concession in 1941). Later in the 1930s, he played an important part in obtaining the first oil concessions for the Trucial Coast, including one for the sheikhdom of Abu Dhabi for 75 years, agreed on 14 January 1939.