Athing Mu (born June 8, 2002) is an American middle-distance runner whose family is of Sudanese origin .
On February 24, 2019, Mu broke the American women's record at the 600 meter event at the 2019 USA Indoor Track and Field Championships with a time of 1:23.57.
She bested the previous American women's record of 1:23.59 held by Alysia Montaño, and nearly broke the women's world record of 1:23.44, held by Olga Kotlyarova.