|Competitor for the United States|
|Gold||1996 Atlanta||4x400 m relay|
|Silver||2000 Sydney||400 m|
|Disqualified||2000 Sydney||4×400 m relay|
He won a gold medal in the 4 x 400 metres relay at both the 1996 and 2000 Summer Olympics and a silver medal in the 400 metres at the 2000 Summer Olympics. He is the twin brother of fellow Olympic medalist Calvin Harrison. At the 2000 Summer Olympics, Alvin Harrison and Calvin Harrison made history by becoming the first twins ever to compete and win Olympic gold medals together on the same relay team since the inception of the modern Olympic Games. In the 4 x 400 m relay, Alvin ran the first leg and Calvin ran the third leg. In 2008, the 2000 Sydney Olympics 4 x 400 metres relay US team was stripped of their medals after teammate Antonio Pettigrew admitted that he had used performance-enhancing drugs.
Alvin Harrison did not compete in the 2004 Olympics due to circumstantial evidence of using a banned substance. In October 2004, Harrison agreed to a four-year suspension with the U.S. Anti-Doping Agency. Harrison also authored the book Go to Your Destiny, which debuted on The Oprah Winfrey Show in 2001. Alvin Harrison was featured in the United Way of America public service announcement "Performance" commercial.
After his suspension expired in late 2008, Harrison enjoyed a late career renaissance via a transfer of allegiance to the Dominican Republic in 2009. He made the move following discussion with his wife and his track colleague Félix Sánchez, both of whom are Dominican. He competed for his new country at the 2009 World Championships in Athletics, running in the heats of the 400 m race. He made his second world appearance soon after and helped the Dominican 4×400-meter relay team to fourth place at the 2010 IAAF World Indoor Championships.
|March 28, 1996||200 m||Fresno, California||20.23|
|June 19, 1996||400 m||Atlanta, Georgia||44.09|
|1996||1996 Summer Olympics||Atlanta, Georgia||1st||4x400 m Relay|
|1998||IAAF Golden League / Grand Prix Final||Moscow, Russia||6th||400 m|
|2000||2000 Olympic Games||Sydney, Australia||2nd||400 m|
|2000||U.S. Olympic Trials||Sacramento, California||2nd||400 m|
- Teammate Antonio Pettigrew later admitted to using performance-enhancing drugs and the International Olympic Committee disqualified the team.
- CNN (2008-08-02). "Pollution, Internet, doping dominate Olympics lead-up". CNN.com. Archived from the original on 5 August 2008. Retrieved 2008-08-02.
- http://www.iaaf.org/mm/Document/Antidoping/SanctionedAthletes/2004ResultsManagement_1162.pdf IAAF
- Graham, Pat (2009-08-18). Alvin Harrison sprinting for Dominican Republic. USA Today. Retrieved on 2010-03-14.
- Arcoleo, Laura (2010-03-14). EVENT REPORT - MEN's 4x400 Metres Relay Final. IAAF. Retrieved on 2010-03-14.