Alvin Leonardo Harrison (born January 20, 1974) is an American former track and field athlete who competed in sprinting events.

While he made the finals in the individual 400 meters, he drew lane one and finished fourth behind Michael Johnson's gold medal performance.

Without their gold medalist and also without world record holder Butch Reynolds, the American team looked vulnerable in the 4 x 400 meters relay.

Alvin Harrison was featured in the United Way of America public service announcement "Performance" commercial.

Alvin Harrison did not compete in the 2004 Olympics due to circumstantial evidence of using a banned substance.