Mark Elliott Jelks (born April 10, 1984) is an American track and field athlete who specializes in the 100-meter dash.
He has a personal best of 9.99 seconds for the event and represented the United States at the 2007 World Championships in Athletics.
In 2014, Jelks made a change in eligibility in order to represent Nigeria internationally.
He represented his new country at the 2014 Commonwealth Games.
He also competes in the 60-meter dash and won the national title at the 2009 USA Indoor Track and Field Championships with a personal record of 6.51 seconds.
He received a two-year doping suspension in 2010 after failing to inform the United States Anti-Doping Agency of his location on three occasions.