Harold Smith may refer to:
Entertainment Harold Jacob Smith (1912–1970), American screenwriter Harold J. Smith (1912–1980), TV actor better known as Jay Silverheels Harold Smith (Twin Peaks), fictional television character
Politics 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 Harold Hill Smith (1910–1994), American geneticist Harold Smith (scientist) (born 1954), founder and CEO of OyaGen
Sports Harold Smith (diver) (1909–1958), American diver and Olympic gold medalist Harold Smith (gridiron football) (born 1962), American football player Harold Smith (sprinter) (born 1893), American sprinter also known as Harold Carman, 2nd in the 220 yards at the 1915 USA Outdoor Track and Field Championships
Other Harold Page Smith (1904–1993), United States Navy admiral J. Harold Smith (1910–2001), Southern Baptist evangelist Harold Smith (detective) (1926–2005), art detective
See also Whatever Happened to Harold Smith?, a 1999 British film Hal Smith (disambiguation)