Michael Duane Johnson is an American retired sprinter who became Olympic Champion four times, and World Champion eight times in the span of his career. He held the world and Olympic records in the 200 m and 400 m, as well as the world record in the indoor 400 m. He also once held the world's best time in the 300 m. Johnson is generally considered one of the greatest and most consistent sprinters in the history of track and field.
Jeremy Matthew Wariner is a retired American track athlete specializing in the 400 meters. He has won four Olympic medals and six World Championships medals. He is the joint sixth fastest competitor in the history of the 400 m event with a personal best of 43.45 seconds, behind Wayde van Niekerk, Michael Johnson and Butch Reynolds and the fifth fastest all-time mark when he set it in 2007.
Angelo F. Taylor is an American track and field athlete, winner of 400-meter hurdles at the 2000 and 2008 Summer Olympics. His personal record for the hurdles event is 47.25 seconds. His time puts him in a tie with Félix Sánchez for the #14 performer of all time. Sánchez also won two Olympic gold medals, in 2004 between Taylor's two golds and 2012, immediately following. Taylor also has a 400-meter dash best of 44.05 seconds, ranking him as the joint 29th performer of all time, superior to any other athlete who has made a serious effort in the 400 metres hurdles. He won the bronze medal in the 400 m at the 2007 World Championships in Athletics.
Darold Williamson is a retired American track athlete. He ran the anchor leg on the US gold medal 4x400 meter relay team at the 2004 Summer Olympics.
Kerron Stephon Clement is a Trinidadian-born American track and field athlete who competes in the 400-meter hurdles and 400-meter sprint. He held the indoor world record in the 400-meter sprint, having broken Michael Johnson's mark in 2005.
Harry Lee "Butch" Reynolds Jr. is an American former track and field athlete who competed in the 400 meter dash. He held the world record for the event for 11 years 9 days with his personal best time of 43.29 seconds set in 1988. That year, he was the silver medalist at the 1988 Seoul Olympics and a relay gold medalist.
Antonio McKay Sr. is a former track and field athlete who specialized in the 400 meters.
Bertland "Bert" Cameron is a retired Jamaican sprinter who mainly competed over 400 metres. He represented Jamaica at three consecutive editions of the Summer Olympics. Cameron won the 400 m title at the first World Championships in Athletics. He was also the 1982 Commonwealth Games champion in the event and won a number of gold medals at regional competitions. He helped the Jamaican runners to a silver medal in the 4×400 metres relay at the 1988 Seoul Olympics.
Diane Lynn Dixon is an American athlete who competed mainly in the 400 metres. She was born in Brooklyn, New York. She has an Olympic gold medal for running with the American 4x400 meters relay team at the 1984 Olympics, running in the preliminary rounds.
LaShawn Merritt is a retired American track and field athlete who competed in sprinting events, specializing in the 400 metres. He is a former Olympic champion over the distance and his personal best of 43.65 seconds makes him the eleventh fastest of all time.
Brenda Taylor is an American track and field athlete who specialises in the 400 meter hurdles. She reached the final of the event at the 2004 Summer Olympics. She also competed at the 2001 World Championships in Athletics and won a medal at the 2003 IAAF World Indoor Championships in the 4×400-meter relay.
Deon Minor is an American former track and field athlete who specialized in the 400 meter dash. He won two consecutive gold medals in the relay at the IAAF World Indoor Championships from 1997 to 1999, setting a world record mark of 3:02.83 minutes in the latter competition.
Michael "Mike" Franks is a former American track and field athlete who competed in the 400-meter dash.
Anthony Raye Ketchum is an American former sprinter.
Tony McQuay is an American track and field athlete who specializes in the 400 meters. He is a member of the 2012 and 2016 United States Olympic teams, winning a silver medal in the 4 × 400 m relay in 2012 and a gold in the same event in 2016. He is also a two time World Champion in this event.
Kyle Clemons is an American track and field sprinter who competed collegiately for the Kansas Jayhawks and specializes in the 400-meter dash. He was the 2014 champion at the USA Indoor Track and Field Championships and won a bronze medal at the 2014 IAAF World Indoor Championships. His personal best for the event is 44.79.
Tiffany Townsend is an American track and field sprinter who competes in the 100 and 200-meter dash. She has personal records of 11.13 and 22.26 seconds for the events, respectively.
Kendall Baisden is an American track and field sprinter who specializes in the 400-meter dash. She holds a personal record of 50.46 seconds for the distance, set in 2014.
Christopher Carl "Chris" Giesting is an American track and field sprinter who competes in the 400-meter dash. He was a gold medalist in the 4 × 400-meter relay at the 2016 IAAF World Indoor Championships. He ran collegiately for the Notre Dame Fighting Irish and won one NCAA indoor title.
Quentin Jarrod Iglehart-Summers is an American former track and field sprinter, who specialized in the 400-meter dash. He set a personal record of 45.46 seconds for the event in 2008. He was a gold medalist in the 4 × 400 metres relay at the IAAF World Indoor Championships in 2012. He also won a relay gold medal at the 2006 World Junior Championships in Athletics. At collegiate level he was a four-time national champion in the relay with the Baylor Bears.
