Bertram Sidney Thomas (13 June 1892 – 27 December 1950) was an English diplomat and explorer who is the first documented Westerner to cross the Rub' al Khali (Empty Quarter).
After working for the Civil Service in the General Post Office, he served in Belgium during World War I.
Besides Arabia Felix, Thomas wrote several other books, including The Arabs: The Epic Life Story of a People Who Have Left Their Deep Impress on the World (London: T. Butterworth, 1930; Garden City, New York: Doubleday, Doran and Co., Inc., 1937).
One of the Society's most prestigious awards, it is offered for outstanding service of a humanitarian nature with a clear geographical dimension.
[7] A recent film called Crossing the Empty Quarter was created by the Anglo-Oman Society's Chairman, Richard Muir — the ex-Ambassador to Oman — from footage taken by Thomas on his journey, and photographs from the Library of the Oriental Institute in Cambridge.