Ernest Holloway Oldham (September 10, 1894 – September 29, 1933) was a cipher clerk in the British Foreign Office who spied for the Soviet Union between 1929 and his death in 1933, in return for money. His job gave him access to highly sensitive communications between Britain and her foreign embassies, and the material he passed to his handler Dmitri Bystrolyotov was highly regarded in Moscow. He had no apparent ideological interest in helping the Soviet Union (unlike the more famous Cambridge spies), but was driven by the large amounts of money paid to him to betray his country. By 1933, the pressures of his activities had led to his sacking from the Foreign Office, alcoholism, domestic violence and ultimately suicide.