Allyson Michelle Felix OLY (born November 18, 1985) is an American track and field sprinter who competes in the 100 meters, 200 meters, and 400 meters. At 200 meters, she is the 2012 Olympic champion, a 3-time World champion (2005–09), and 2-time Olympic silver medalist (2004–08). At 400 meters, she is the 2015 World champion, 2011 World silver medalist, 2016 Olympic silver medalist, and 2017 World bronze medalist.
Felix has won five additional Olympic gold medals as a member of the United States' women's relay teams: three at 4 × 400 meters (2008–16), and two at 4 x 100 meters (2012–16). The 2012 U.S. Olympic 4 x 100 meters team also set the women's 4x100 meters world-record that still stands. Felix is the only female track and field athlete to ever win six Olympic gold medals, and is tied with Merlene Ottey as the most decorated female Olympian in track and field history, with a total of nine Olympic medals. Felix is also the most decorated athlete in IAAF World Championships history with 16 career medals.
Felix's 200 meters best of 21.69 secs from 2012, ranks her sixth on the all-time list. In 2013, she broke the world best for the rarely contested 150 meters distance, running 16.36 secs. In the 4 × 400 metres relay at the 2015 World Championships, she ran the fastest split ever recorded by an American woman, and third fastest split ever after Jarmila Kratochvilova and Marita Koch, with 47.72.