Juan Luis Barrios Nieves (born June 24, 1983) is a Mexican runner. He competed in the 5000 m at the 2008 and 2012 Olympics and finished seventh-eighth. He placed 14th in the same event at the 2007 and came 18th in the 10,000 metres at the 2009 World Championships. Barrios was the inaugural winner of the NACAC Cross Country Championships in 2005 and repeated the feat the following year, in addition to taking the team gold with Mexico. He made his debut over the marathon distance in March 2011, running at the LALA International Marathon in Torreon, Coahuila, and recorded a time of 2:14:20 hours.