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- Hank Allen (born 1940), former Major League Baseball outfielder
- Harry Allen, several people
- Harvey A. Allen (c. 1818–1882), United States Army officer, was Commander of the Department of Alaska 1871-1873.
- Harvey Allen (1910–1977), NASA engineer and administrator
- Holless Wilbur Allen (1880–1966), inventor of the compound bow
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