Justin Gatlin (born February 10, 1982) is an American athlete.

Born in Brooklyn, New York, he attended Woodham High School in Pensacola, Florida, and currently lives and trains in Raleigh, North Carolina.

In the fall of 2000, Gatlin arrived at University of Tennessee as a good high school 110 m hurdler. After training and competing in UT's program two years under the guidance of former Vol assistant Vince Anderson , Gatlin won six consecutive NCAA titles. In fall 2002, Gatlin left Tennessee after his sophomore season to join the professional ranks. Just two years later, he won the gold medal in the 100 m (9.85 sec) in the 2004 Summer Olympics, narrowly beating Francis Obikwelu of Portugal and the defending champion Maurice Greene. He also won a bronze medal in a USA sweep of the 200 m race, and a silver as a member of the 4x100 m relay squad.

Gatlin's Olympic 100m final time is the second fastest in Olympic history, and his fastest recorded 200m time of 19.86 seconds, although wind-aided, is the fastest mark for a junior (under 20) athlete.