The women's 400 metres at the 2004 Summer Olympics as part of the athletics program were held at the Athens Olympic Stadium from August 21 to 24. The winning margin was 0.14 seconds.
The women's 400 metres at the 2009 World Championships in Athletics was held at the Olympic Stadium on 15, 16 and 18 August. The world-leader prior to the competition, Sanya Richards, was regarded as the favourite in the event, although her previous failure to convert circuit dominance to major championship success raised some doubts. Reigning Olympic and world champion Christine Ohuruogu entered the championships as only the 25th fastest in the world that year, although a low-key run up also preceded her previous victories. Jamaicans Shericka Williams and Novlene Williams-Mills were predicted as possible medallists, while Russian Antonina Krivoshapka held the second fastest time in the world prior to the tournament.
The men's 400 metres at the 2011 IPC Athletics World Championships is held at the QEII Stadium on 22-23 and 26–29 January
The women's 800 metres event at the 2014 World Junior Championships in Athletics was held in Eugene, Oregon, United States, at Hayward Field on 22, 23 and 24 July.
The women's 400 metres at the 2015 World Championships in Athletics was held at the Beijing National Stadium on 24, 25 and 27 August. Christine Ohuruogu of Great Britain entered the competition as the defending champion.
The men's 400 metres at the 2019 World Para Athletics Championships was held in Dubai from 7–15 November.
The women's 400 metres at the 2021 European Athletics Indoor Championships took place in three rounds at the Arena Toruń in Toruń, Poland, on 5 and 6 March 2021.
The women's 200 metres event at the 2021 Summer World University Games was held on 3 and 4 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The women's 4 × 400 metres relay event at the 2021 Summer World University Games was held on 5 and 6 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The women's 4 × 100 metres relay event at the 2021 Summer World University Games was held on 5 and 6 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The men's 4 × 400 metres relay event at the 2021 Summer World University Games was held on 5 and 6 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The men's 4 × 100 metres relay event at the 2021 Summer World University Games was held on 5 and 6 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The women's 100 metres event at the 2021 Summer World University Games was held on 1 and 2 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The men's 400 metres hurdles event at the 2021 Summer World University Games was held on 2, 3 and 4 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The women's 400 metres hurdles event at the 2021 Summer World University Games was held on 1, 2 and 3 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The men's 400 metres event at the 2021 Summer World University Games was held on 1, 2 and 3 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The women's 800 metres event at the 2021 Summer World University Games was held on 2 and 3 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The women's 100 metres hurdles event at the 2021 Summer World University Games was held on 3 and 4 August 2023 at the Shuangliu Sports Centre Stadium in Chengdu, China.
The women's 4 × 400 metres relay event at the 2023 European Athletics U23 Championships was held in Espoo, Finland, at Leppävaara Stadium on 15 and 16 July.
The women's 400 metres hurdles at the 2024 Summer Olympics was held in four rounds at the Stade de France in Paris, France, from 4 to 8 August 2024. This was the eleventh time that the women's 400 metres hurdles was contested at the Summer Olympics. A total of 40 athletes were able to qualify for the event by entry standard or ranking.
