Dathan Ritzenhein (born December 30, 1982 in Grand Rapids, Michigan) is an American long-distance runner. He held the American record in the 5,000 metres (12:56.27) from 2009–10, when it was broken by Bernard Lagat. He is a three-time national cross country champion with wins at the USA Cross Country Championships in 2005, 2008 and 2010. He now competes professionally for Nike and is coached by Alberto Salazar.
Ritzenhein was a standout runner at Rockford High School in Michigan and the University of Colorado at Boulder. He was part of the stellar high school class of 2001 that also produced American mile record holder Alan Webb and American half-marathon record holder Ryan Hall.
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