Roxbert Martin is a former Jamaican 400 metres runner, who was selected for the Jamaican 4x400 metres relay team at the 1996 Summer Olympics and won a bronze medal. He was part of the gold-medal-winning relay team at the 1998 Commonwealth Games, setting the championship record.
Martyn Joseph Rooney is an English sprinter who specialises in the 400 metres event. He reached the 400 m final at the 2008 Summer Olympics and won bronze in the 4×400 metres relay. A mainstay on the anchor leg of the Great Britain and England 4 x 400 metre relay teams, at the 2009 World Championships in Athletics he won a silver medal with the Great Britain relay team, and bronze in the 2015 and 2017 World Championships.
David Gillick is an Irish international track and field athlete. He began his education in Our Lady's Boys School and attended St Benildus College secondary school in Kilmacud. He studied at Dublin Institute of Technology before moving to Loughborough University in the United Kingdom to train as a full-time athlete with coach Nick Dakin. Gillick specialises in the 400 metres and he won the European Indoor Championship in 2005 and 2007, as well as the Irish National Outdoor Championship in 2006 and 2007. He set the Irish Indoor record of 45.52 seconds in the 2007 final. The time also beat the Irish outdoor record of 45.58 and was within the Olympic 'A' qualifying standard for the 2008 Games. On 4 July 2009 he ran 44.77 seconds in a race in Madrid to set a new national record. He is also the 2009 Irish national 200 m champion.
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.
Lerone Ephraime Clarke is a Jamaican track and field sprinter who specialises in the 100 metres and the 60 metres. He is the former Commonwealth Games champion in the 100 m. His personal best for that distance is 9.99 seconds, set in 2009. He has represented Jamaica three times at the IAAF World Indoor Championships and holds the Jamaican record for the indoor 150m.
Halima Hachlaf is a Moroccan runner who specializes in the 800 metres. She is the younger sister of Abdelkader Hachlaf, an international steeplechase athlete. She won silver medals in the 800 m at the Mediterranean Games and Jeux de la Francophonie in 2009. Her personal best for the distance is 1:58.27.
Kirani Zeno James COG is a Grenadian professional sprinter who specializes in the 400 metres. He won the 400 m at the World Championships in 2011 and won the gold medal at the 2012 London Olympics. In the 400 metres, James also won the silver medal at the 2016 Rio Olympics and a bronze medal at the 2020 Tokyo Olympics, thus becoming the first man to earn the full set of three medals in the centennial history of the event. He is Grenada's first Olympic medalist. He holds the Grenadian national record in both the 200 metres and 400 metres.
Robert Lathouwers is a former Dutch athlete who mainly focused on the 400 and 800 metres.
Michael Walter Mathieu is a retired Bahamian sprinter hailing from Freeport, Grand Bahama who specialized in the 200 metres and 400 metres. He was part of the Bahamian silver medal-winning team in the men's 4×400 metres relay at the 2008 Beijing Olympics, running second leg and recording a 44.0 split, and the gold medal-winning team at the 2012 Summer Olympics. He was also a part of second place relay team at the 2007 World Championships. He won the bronze medal in the 4x400 metres relay in the 2016 Summer Olympics.
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.
Kaliese Spencer Carter is a Jamaican track and field athlete who specialises in the 400 metres hurdles. She won the bronze medal in the event at the 2012 London Olympics. Spencer was the Commonwealth Games champion in 2014 and a double silver medallist at the 2014 World Indoor Championships. She finished fourth at both the 2009 and 2011 World Championships in Athletics.
Muizat Ajoke Odumosu Alademerin is a Nigerian track and field athlete who specialises in the 400 metres and the 400 metres hurdles. She represented Nigeria at the 2008 and 2012 Summer Olympics and competed at the World Championships in Athletics in 2007, 2009, 2011 and 2013. She was the bronze medallist at the 2007 All-Africa Games and went on to become the continental champion with a win at the 2008 and 2012 African Championships.
Ricardo Chambers is a Jamaican track and field athlete who specialises in the 400 metres.
Omar Cisneros Bonora is a Cuban track and field athlete who competes in the 400 metres hurdles. He is the Cuban national record holder for the event with his personal best of 47.99 seconds. He won gold medals in the hurdles and 4×400 metres relay at the Pan American Games in 2011.
Lalonde Keida Gordon, HBM is a Tobagonian male track and field sprinter who specialises in the 400 metres. He won the bronze medal at the 2012 London Olympics with a personal best of 44.52 seconds. He is the fourth fastest 400 m runner from his country after Jereem Richards, Machel Cedenio and Ian Morris.
Rusheen McDonald is a Jamaican sprinter. Competing at the 2012 Summer Olympics, Rusheen was in the 400 metres and 4 x 400 metres relay.
Edino Steele is a Jamaican sprinter. He is known for winning a silver medal in the 4 x 400 metre at the 2008 IAAF World Indoor Championships; and for his controversial failed appearance on the 2012 Jamaican Olympics 4 x 400 team at the 2012 Summer Olympics. He competed in the 4x400 metres relay event at the 2013 World Championships in Athletics, winning a silver medal.
Jermaine Brown is a Jamaican track and field sprinter. He competes in distances from 60 metres to 400 metres. He has a 200 metres best of 20.29 seconds and a 400 m best of 46.24 seconds. He mainly competes internationally in relay competitions.
Jason Livermore is a Jamaican track and field sprinter who competes in the 100 metres and 200 metres. He has personal bests of 10.05 seconds and 20.13 seconds for the distances, respectively. He was the bronze medallist in the 200 m at the 2014 Commonwealth Games.
Jacqueline "Jackie" Pusey is a Jamaican former track and field sprinter. She competed over distances from 100 metres to 400 metres. She represented Jamaica at the 1976 Summer Olympics and competed a second time at the 1980 Summer Olympics.
Jamaica 
