Harold William Vazeille Temperley, OBE, FBA (20 April 1879 – 11 July 1939) was a British historian, Professor of Modern History at the University of Cambridge from 1931, and Master of Peterhouse, Cambridge.
Temperley was born in Cambridge, the son of Ernest Temperley, a Fellow and Bursar of Queen's College, Cambridge. He was educated at Sherborne School and King's College, Cambridge, where he obtained a First in History. He became a lecturer at the University of Leeds in 1903, before taking a fellowship at Peterhouse, Cambridge, in 1905.
Temperley's field was modern diplomatic history, and he was heavily involved as editor in the publication of the British Government's official version of the diplomatic history of the early twentieth century. He also wrote on George Canning and Eastern European history.
During World War I, Temperley was commissioned into the Fife and Forfar Yeomanry, missing the Gallipoli landings due to illness. He was then seconded to the War Office, working on intelligence and policy in the Balkans. His History of Serbia was published in 1917.
He attended the Paris Peace Conference of 1919 and later worked on an official history of it, on a scheme devised by George Louis Beer and Lord Eustace Percy. He was British representative on the Albanian boundary commission; and was an advisor in 1921 to Arthur Balfour at the League of Nations.