Claudia Marx is a German athlete. She runs in the 400 metres and the 400 metres hurdles. She also competes in the German team in the 4 × 400 metres relay. She won the 400 metres at the German Athletics Championships in 2003 and 2004 and in the National Indoor Championships in 2005. She is 1.72 metres tall and weighs 59 kg. She currently studies sport sciences at the Humboldt University of Berlin. she came 4th in 400m hurdles.
Brigitte Heike Meissner is a retired German athlete. She competed mainly in the 400 metres hurdles, but also spent two seasons specializing in the 800 metres. Notable achievements include a silver medal at the 2002 European Championships, medals in 4 x 400 metres relay at the 1994 European Championships and the 1997 World Indoor Championships and a fourth place at the 1995 World Championships.
Janeth Jepkosgei Busienei is a Kenyan middle distance runner and former world champion.
Yuliya Sergeyevna Pechonkina, née Nosova is a Russian former athlete who specialized in the 400 metres hurdles and 4 × 400 metres relay. She was previously married to former sprinter Evgeny Pechonkin.
Sabine Busch is a retired East German athlete, who specialised in the 400 metres and the 400 metres hurdles. In 1987, she became the World Champion at 400 m hurdles and the World Indoor Champion at 400 m.
Anastasiya Rabchenyuk is a Ukrainian hurdler. She was born in Ternivka, at the time in the Ukrainian SSR of the Soviet Union. She is a world top level 400 m hurdles runner.
Tiffany Williams is an American hurdler who is a former US 400m hurdles champion in 2007 and 2008.
Huang Xiaoxiao is a Chinese hurdler who specialises in the 400 metres hurdles.
Nickiesha Wilson is a hurdler from Jamaica. She competes in the 100 m hurdles and the 400 m hurdles.
Zuzana Hejnová is a retired Czech athlete who specialised in the 400 metres hurdles. She won the silver medal in the event at the 2012 London Olympics. Hejnová is a two-time World Champion, having claimed titles at the 2013 and 2015 World Championships in Athletics. She won bronze at the 2012 European Championships and silver for the 400 metres at the 2017 European Indoor Championships.
Tristan Thomas is an Australian track and field athlete specialising in the 400 metres hurdles.
Peirresha Alexandra Shakes-Drayton is a British retired track and field athlete. After specialising in the 400 metres hurdles in the early part of her career, a knee injury at the 2013 World Championships forced Shakes-Drayton to concentrate on the 400 metres on her return to athletics. She is the 2013 European Indoor Champion in the 400 metres and won a 2012 World Indoor Championship gold medal in the 4 x 400 metres relay. She has also won silver and bronze medals in the 4 × 400 m relay at the World Championships.
Lucimar Teodoro is a Brazilian track and field athlete who specialises in the 400 metres sprint and the 400 metres hurdles.
Phara Anacharsis is a French athlete who specializes in the 400 metres and the 400 metres hurdles.
Sylvanie Morandais is a retired French athlete who specialized in the 400 metres hurdles.
Irina Lenskiy is a Ukrainian-born Israeli athlete who specializes in the 100 metres hurdles.
Spencer gave birth to son Michael Carter Jr on April 25,2021
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.
Lauren Boden is an Australian athletics competitor. Her events are the 400 metre hurdles, 400 metres and long jump. She was the youngest woman to win the 400 metres hurdle event at the Australian national championships. She has competed in the long jump event and the 400 metres hurdle event at the World University Games. She has competed at the 2006 and 2010 Commonwealth Games and the 2012 and 2016 Summer Olympics in the 400 metre hurdles event.
Benedicte Hauge is a Norwegian sprinter who specializes in the 400 metres, and formerly also the 400 metres hurdles.
Liberia 
