Taekwondo was first included as a full medal sport in the Olympics in 2000.
Six athletes have won two gold medals:
Steven Lopez(USA) 2000/2004 (has also won a bronze medal)
Hadi Saei (Iran) 2004/2008 (has also won a bronze medal)
Hwang Kyung-Seon (South Korea) 2008/2012 (has also won a bronze medal)
Chen Zhong (China) 2000/2004
Wu Jingyu (China) 2008/2012
Jade Jones (Great Britain) 2012/2016
The only athletes to have won three medals are the three listed above and Maria Espinoza (Mexico) who has won medals in each Games since 2008 (one gold).