Noah Dietrich (February 28, 1889 – February 15, 1982) was an American business executive, who acted as Chief Executive Officer of the Howard Hughes empire (1925-57), when, according to his own memoir, he left the Hughes operation over a dispute involving putting more of his income on a capital gains basis. The manuscript of his eventual memoir, , may have been a key, if inadvertent, source of novelist Clifford Irving's infamous fake autobiography of Hughes.