Kevin Borlée is a Belgian sprinter, who specializes in the 400 metres. He is a member of the Borlée family.
Jonathan Borlée is a former Belgian sprinter, who specializes in the 400 metres. He is a member of the Borlée family.
Yunier Pérez Romero is a Cuban track and field athlete, who specializes in sprinting events.
Susana Aylen Clement Quezada is a Cuban track and field athlete, who specialized in the 400 metres. She won gold medals for the national relay team at the 2009 Central American and Caribbean Championships in Havana, and also, at the 2011 Pan American Games in Guadalajara, Mexico.
Precious Oluoma Nwoke Bichiri is a Nigerian track and field athlete, who specialized in the 400 metres. Nwoke competed for the women's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with her teammates Folashade Abugan, Joy Amechi Eze, and Muizat Ajoke Odumosu. She ran on the third leg of the second heat, with an individual-split time of 51.83 seconds. She and her team finished the relay in fourth place for a seasonal best time of 3:24.10, giving them a qualifying slot for the final round based on performance. By the following day, Nwoke and her team placed seventh in the finals, with another seasonal best time of 3:23.74.
Carline Muir is a Canadian sprinter, who specialized in the 400 metres. She won the bronze medal for the 400 metres, and ultimately, led her national team to claim the sprint relay title at the 2009 Summer Universiade in Belgrade, Serbia. She is also a three-time junior national champion, a two-time silver medalist at the Canadian Track and Field Championships.
Konstadinos Anastasiou is a Greek sprinter, who specialized in the 400 metres. Anastasiou competed for the men's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with his teammates Stylianos Dimotsios, Dimitrios Gravalos, and Pantelis Melachroinoudis. He ran on the anchor leg of the second heat, with an individual-split time of 46.63 seconds. Anastasiou and his team finished the relay in seventh place for a seasonal best time of 3:04.30, failing to advance into the final.
Dimitrios Gravalos is a Greek sprinter, who specialized in the 400 metres. He won the gold medal for the 400 metres at the 2003 European Junior Championships in Tampere, Finland, with a time of 46.54 seconds.
Pantelis Melachroinoudis is a Greek sprinter, who specialized in the 400 metres. Melachroinoudis competed for the men's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with his teammates Stylianos Dimotsios, Konstadinos Anastasiou, and Dimitrios Gravalos. He ran on the third leg of the second heat, with an individual-split time of 45.15 seconds. Melachroinoudis and his team finished the relay in seventh place for a seasonal best time of 3:04.30, failing to advance into the final.
Mitsuhiro Abiko is a Japanese sprinter, who specialized in the 400 metres. Abiko competed in the men's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with his teammates Kenji Narisako, Dai Tamesue, and Yoshihiro Horigome. He ran on the starting leg of the second heat, with an individual-split time of 46.70 seconds. Abiko and his team finished the relay in sixth place for a seasonal best time of 3:04.18, failing to advance into the final.
Sayaka Aoki is a Japanese track and field sprinter and hurdler, who specializes in the 400 metres sprint and 400 metres hurdles. She competed for her country as part of the Japanese women's 4 × 400 metres relay team at the Summer Olympics in 2008 and the World Championships in Athletics three times. She has been a four-time medallist in the relay at the Asian Athletics Championships, including a gold medal in 2011. She won her first major international medal in the hurdles – a bronze – at the 2017 Asian Athletics Championships.
Mayu Kida is a retired Japanese sprinter, who specialized in the 400 metres. Kida competed for the women's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with her teammates Sayaka Aoki, Satomi Kubokura, and Asami Tanno. She ran on the third leg of the first heat, with an individual-split time of 52.72 seconds. Kida and her team finished the relay in last place for a seasonal best time of 3:30.52, failing to advance into the final.
Josiane da Silva Tito is a Brazilian sprinter and middle-distance runner.
Maria Laura Almirão is a Brazilian sprinter, who specialized in the 400 metres. She is a two-time Olympian and a five-time medalist for the 400 metres and sprint relay at the Ibero-American Championships.
Yoel Armando Tapia Gómez is a Dominican sprinter, who specialized in the 400 metres. He won two medals for the national relay team at the 2007 Pan American Games in Rio de Janeiro, Brazil, and also, at the 2011 Pan American Games in Guadalajara, Mexico.
Pieter Smith is a South African sprinter, who specialized in the 400 metres. He set his personal best time of 45.63 seconds by winning the 400 metres event at the 2009 South African Championships in Stellenbosch.
Pedro Juan Mejía Eusebio is a Dominican sprinter, who specialized in the 400 metres. He won two bronze medals, as a member of the Dominican Republic national team, in the men's 4 × 400 m relay at the 2007 Pan American Games in Rio de Janeiro, Brazil, and at the 2008 IAAF World Indoor Championships in Valencia, Spain.
Jovon Toppin is a Trinidadian sprinter, who specialized in the 400 metres. Toppin competed for the men's 4 × 400 m relay at the 2008 Summer Olympics in Beijing, along with his teammates Ato Modibo, Cowin Mills, and Stann Waithe. He ran on the second leg of the second heat, with an individual-split time of 45.92 seconds. Toppin and his team finished the relay in fifth place, for a seasonal best time of 3:04.12, failing to advance into the final.
Cowin Mills is a Trinidadian sprinter, who specialized in the 400 metres. He is a 2007 NCAA All-American honoree, and a member of the track and field team for the Clemson Tigers. He is also a graduate of management at Clemson University in Clemson, South Carolina.
Stann Waithe is a Trinidadian sprinter, who specialized in the 400 metres. He is a member of the track and field team for the Michigan Wolverines, while attending the University of Michigan in Ann Arbor, Michigan.
Belgium 
