Justin Gatlin (born February 10, 1982) is an American sprinter and former Olympic and world champion. His 100m personal best of 9.74 seconds ranks fifth on the all-time list. He is a two-time indoor world champion in the 60-meter dash, and won both the 100 meters and 200 meters at the 2005 World Championships.

In 2001, Gatlin incurred a two-year ban from athletics for testing positive for a banned substance; the ban was later reduced to one year on appeal. In 2006, he incurred a four-year ban (originally an eight-year ban) from track and field for testing positive for a banned substance, with this sanction erasing his then-world-record time of 9.77s in the 100m. Gatlin began competing again in August 2010, soon after his eligibility was reinstated. In June 2012 at the US Olympic trials, Gatlin ran a time of 9.80s, which was the fastest-ever time for a man over the age of 30.

Gatlin won the gold medal in the 100 m at the 2004 Olympics. After not competing in the 2008 Olympics due to suspension, he ran a time of 9.79s in the 100 m final at the London 2012 Olympics, earning a bronze medal. His performance at the 2012 Olympic 100 meter final contributed to the fastest 100m race ever, which saw three men run under the 9.80-second barrier. He won his third Olympic medal in the 100 meters in the 2016 Olympic 100 meter final, finishing with the silver. At 34, he became the oldest man to win an Olympic medal in a non-relay sprint event.

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