Cyril John Gadd, CBE, FBA, FSA (2 July 1893 – 2 December 1969) was a British Assyriologist, Sumerologist, and curator.

He was Keeper of the Department of Egyptian and Assyrian Antiquities, British Museum from 1948 to 1955, and Professor of Ancient Semitic Languages and Civilizations at the School of Oriental and African Studies, University of London from 1955 to 1960.

[1] His studies were interrupted by the First World War, and he served in the British Army on the Western Front from 1915 to 1918, first in the Worcestershire Regiment and then in the Royal Engineers.

[3] He additionally worked on excavations at Ur, Carchemish, Alalakh and Nimrud, and published on texts from those site dating from c. 2600–539 BCE.

[2] Having risen to keeper, he left the British Museum to enter academia, as Professor of Ancient Semitic Languages and Civilizations, at the School of Oriental and African Studies, University of London.