Justin Adam Harding (born 9 February 1986) is a South African professional golfer.
Harding played college golf at Lamar University in Texas and represented his country as an amateur golfer. Having graduated, he earned a place on the Sunshine Tour at the first attempt, finishing third at the 2009 qualifying school while still an amateur. He won a tournament in each of his first three seasons on the tour, 2010, 2011 and 2012. He won again in 2015 and 2016 and then twice in two weeks in 2018.
In July 2018 Harding made a rare appearance outside Africa and won the Bank BRI Indonesia Open on the Asian Tour by a stroke from Scott Vincent. Two weeks later he won the Royal Cup in Thailand by 6 strokes, his fourth win in three months.