Great Britain, the team of the British Olympic Association (BOA), competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004 with the team of selected athletes was officially known as Team GB. The British sent a wide-ranging delegation to the Games, continuing its ubiquitous presence in the Olympic games, the only country to have sent competitors to every summer and winter games since the birth of the modern Olympics in 1896. Great Britain's 264 athletes, 161 men and 103 women, competed in 22 disciplines throughout the two-week event. The team entered the opening ceremony behind the Union Flag carried by judoka Kate Howey. Double gold medal winner Kelly Holmes carried the flag at the closing ceremony.
Canoeing at the 2012 Summer Olympics in London were contested in two main disciplines: canoe slalom, from 29 July to 2 August, and canoe sprint, from 6 to 11 August. The slalom competition was held at the Lee Valley White Water Centre and the sprint events were staged at Eton College Rowing Centre, at Dorney Lake, known as Eton Dorney.
Canada, represented by the Canadian Olympic Committee (COC), competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012. Canadian athletes have competed in every Summer Olympic Games since 1900, except the 1980 Summer Olympics in Moscow because of the country's support for the United States-led boycott. Canada sent a total of 281 athletes to the Games to compete in 24 sports. The COC set a goal of finishing in the top 12 for total medals; but the nation failed to achieve this, finishing with a total of 18 medals. Canada matched its total medal count from Beijing 2008. At London, with the initiation of its "Own the Podium" programme, Canada finished 13th in total medals, thus improving on its 14th place performance in Beijing while falling somewhat short of its self-declared goal of 12th position. It finished the event with 18 medals: two gold, five silver and 11 bronze.
Australia competed at the 2012 Summer Olympics in London, from 27 July to 12 August 2012. Australian athletes have competed in every Summer Olympic Games of the modern era. The Australian Olympic Committee sent a total of 410 athletes to the Games to compete in 23 sports.
France competed at the 2012 Summer Olympics in London, between 27 July and 12 August 2012. French athletes have competed in every Summer Olympic Games of the modern era. The French Olympic Committee sent a total of 330 athletes to the Games, 183 men and 147 women, to compete in 24 sports.
Ireland competed at the 2012 Summer Olympics in London, United Kingdom, from July 27 to August 12, 2012. This was the nation's twentieth appearance at the Summer Olympics.
The men's 100 metres competition at the 2012 Summer Olympics in London, United Kingdom was held at the Olympic Stadium on 4–5 August 2012. Seventy-four athletes from 61 nations competed. Each nation was limited to 3 athletes per rules in force since the 1930 Olympic Congress. The competition comprised four rounds: a preliminary round for entrants without the minimum qualifying standard, a heats round, followed by three semi-finals of eight athletes each, which then reduced to eight athletes for the final.
Rūta Meilutytė is a retired Lithuanian swimmer, Olympic gold medalist, and world record-holder. She is the current world record holder in the 100 metre breaststroke.
The men's canoe slalom C-1 competition at the 2012 Olympic Games in London took place between 29 and 31 July at the Lee Valley White Water Centre. Seventeen canoeists from 17 nations competed.
The men's canoe slalom C-2 competition at the 2012 Olympic Games in London took place between 30 July and 2 August at the Lee Valley White Water Centre. Twenty-eight canoeists from 12 countries competed.
The men's canoe slalom K-1 competition at the 2012 Olympic Games in London took place between 29 July and 1 August at the Lee Valley White Water Centre.
The women's canoe sprint K-2 500 metres competition at the 2012 Olympic Games in London took place between 7 and 9 August at Eton Dorney.
The women's canoe sprint K-4 500 metres competition at the 2012 Olympic Games in London took place between 6 and 8 August at Eton Dorney.
At the 8th National Games of the People's Republic of China, the athletics events were held in Shanghai in October 1997.
The men's 400 metres event at the 2016 Summer Olympics took place between 12 and 14 August at the Olympic Stadium. Fifty-three athletes from 35 nations competed. The event was won by Wayde van Niekerk of South Africa, the nation's second gold medal in the men's 400 metres. Kirani James of Grenada and LaShawn Merritt of the United States became the sixth and seventh men to win two medals in the event, but Michael Johnson remained the only man with two gold medals.
The women's 100 metres hurdles event at the 2016 Summer Olympics took place between 16–17 August at the Olympic Stadium.
Elaine Thompson-Herah is a Jamaican sprinter who specialises in the 100 metres and 200 metres. She is a five-time Olympic champion, having won gold in both the 100 and 200 metres at the 2016 Summer Olympics in Rio de Janeiro and again at the 2020 Summer Olympics in Tokyo.
Denmark competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. Danish athletes have appeared in every edition of the Summer Olympic Games, with the exception of the 1904 Summer Olympics in St. Louis.
The men's 100 metres event at the 2020 Summer Olympics took place on 31 July and 1 August 2021 at the Olympic Stadium. 84 athletes were expected to compete; 27 nations used universality places to enter athletes in addition to the 56 qualifying through standard time or ranking. 78 athletes from 59 nations competed. Marcell Jacobs won the gold medal, establishing twice, semifinal and final, the new European record, Italy's first medal in the men's 100 metres. The United States extended its podium streak in the event to six Games with Fred Kerley's silver, only third at the US Trials. Canadian Andre De Grasse won his second consecutive bronze medal in the 100 metres establishing his personal best. With Usain Bolt retired, Jamaica's three-Games gold medal streak ended.
The women's 100 metres event at the 2020 Summer Olympics took place on 30 and 31 July 2021 at the Japan National Stadium. Approximately eighty athletes competed at the event; the exact number was dependent on how many nations use universality places to enter athletes in addition to the 56 qualifying through time or ranking. The defending champion, Elaine Thompson-Herah, won the event, setting a new Olympic record. This was her third gold Olympic medal. The 2016 bronze medalist and the 2008 and 2012 champion in this event, Shelly-Ann Fraser-Pryce, finished second. Shericka Jackson won the bronze medal, completing the podium sweep for Jamaica.
