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Harold Smith (New Zealand politician) (1866–1936), New Zealand MP •
Harold Smith (British politician) (1876–1924), MP for Warrington, 1910–1922, and Liverpool Wavertree, 1922–1923 •
Harold Gengoult Smith (1890–1983), Australian medical practitioner and Lord Mayor of Melbourne •
Harold D. Smith (1898–1947), American budget director during World War II •
Harold Palmer Smith Jr. (born 1935), assistant secretary of Defense ==Science==