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Derek Mandell (born September 18, 1986, in Tamuning, Guam) is a Guamanian middle-distance runner. He took part in the 2008 Oceania Athletics Championships, winning bronze, and 2008 Summer Olympics, where he broke a personal men's 800m record even though Mandell was eliminated in the first round. He later competed in the , where he won two gold medals, the 2011 Pacific Games, where he won a silver medal, and the 2011 World Championships in Athletics, where he set a personal best time of 1:57.11.