Wallace Spearmon Jr. (born December 24, 1984, in Chicago, Illinois, USA) is a retired American sprint athlete who specialized in the 200 meters.

He has a personal best of 19.65 seconds for the distance, making him the thirteenth fastest 200 meter runner of all time, and he formerly held the indoor American record.

Spearmon is a graduate of Fayetteville High School and attended the University of Arkansas, where he competed collegiately for two seasons before turning pro.

Only world record holder Usain Bolt (19.19), Yohan Blake (19.26), Noah Lyles (19.31), Michael Johnson (19.32), Erriyon Knighton (19.49), Walter Dix (19.53), Justin Gatlin (19.57), his training partner Tyson Gay (19.58), Andre de Grasse (19.62), Xavier Carter (19.63), and Reynier Mena (19.63) have run faster.

Spearmon initially finished in the bronze medal position in the 200 m in the 2008 Summer Olympics in Beijing, but was disqualified for stepping out of his lane.

The second-place finisher, Churandy Martina of the Netherlands Antilles, was also disqualified, giving Americans Shawn Crawford and Walter Dix the silver and bronze medals, respectively.

On an April 2011 episode of MythBusters, he worked with Adam Savage and Jamie Hyneman to investigate the possibility of a human running on water.