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Frank J. Loomis, Jr. (August 22, 1896 - November 3, 1962) was an American athlete, winner of 400 m hurdles at the 1920 Summer Olympics.
Although Frank Loomis was an AAU champion in 220 yd hurdles in 1917 and 1918 and in 440 yd hurdles in 1920, the main favourite in Antwerpen was John Norton, who had run a new world record of 54.2 just two months before Olympics. Despite that, Loomis won the 400 m hurdles final easily in a new world record of 54.0, beating Norton to a second place by 0.6 seconds.
| Olympic medalists in athletics (men) | Olympic Champions in Men's 400 m hurdles |
| John Tewksbury | Harry Hillman | Charles Bacon | Frank Loomis | Morgan Taylor | David Burghley | Bob Tisdall | Glenn Hardin | Roy Cochran | Charles Moore | Glenn Davis (twice) | Rex Cawley | David Hemery | John Akii-Bua | Edwin Moses (twice) | Volker Beck | André Phillips | Kevin Young | Derrick Adkins | Angelo Taylor | Felix Sanchez |