Timothy O'Donnell (triathlete)

Timothy O'Donnell (born October 1, 1980) is an American long-distance triathlete. He is the winner of the 2009 ITU Long Distance Triathlon World Championships, and third placed athlete in the 2015 Ironman World Championship

O'Donnell was originally a swimmer who began competing in triathlon on the advice of his brother while at the United States Naval Academy. In 2013, O'Donnell won Ironman Brazil with a time 8:01:32. He was 5th at the 2013 Ironman World Championship and was the first American to cross the line. In 2014 O'Donnell announced that he had begun working with Mark Allen in preparation for the 2014 Ironman World Championship. He experienced a disappointing finish at the championship when he experienced stomach pain and walked during the marathon. He finished third in the 2015 Ironman World Championship, where he completed the bike leg behind winner Jan Frodeno, before eventually being overtaken on the run by Andreas Raelert.

O'Donnell married fellow triathlete Mirinda Carfrae in 2013.