For the athletics at the 2020 Summer Olympics competitions, the following qualification systems were in place. Qualification ended on 29 June 2021, but for marathon and 50 km race walking, it ended on 31 May 2021. Some 1900 athletes, from 196 countries, competed. 103 countries qualified also through Universality places.
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, as well as collecting 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 - after he placed only third at the U.S. trials. Canadian Andre De Grasse won his second consecutive bronze medal in the 100 metres, while running a 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. 71 athletes from 55 nations competed at the event.
The women's 200 metres event at the 2020 Summer Olympics took place on 2 and 3 August 2021 at the Japan National Stadium. 41 athletes from 31 nations competed. In successfully defending her title, Elaine Thompson-Herah became the first woman in history to win both the 100 and 200 metres titles at successive games. Her winning time of 21.53 secs, moved her to second on the world all-time list behind Florence Griffith Joyner, and broke Merlene Ottey's 30-year-old Jamaican record. The winning margin was 0.28 seconds. Surprisingly, Thompson-Herah had the slowest reaction time in the final.
The women's 5000 metres event at the 2020 Summer Olympics took place on 30 July and 2 August 2021 at the Japan National Stadium. Approximately 45 athletes competed; the exact number was dependent on how many nations use universality places to enter athletes in addition to the 42 qualifying through time or ranking.
The women's 100 metres hurdles event at the 2020 Summer Olympics took place between 31 July and 2 August 2021 at the Japan National Stadium. 40 athletes from 28 nations competed. In the semifinals, Jasmine Camacho-Quinn of Puerto Rico broke the Olympic record, running 12.26 secs, to go equal fourth on the world all-time list. The following day in the final, she won the gold medal with a time of 12.37 secs. American world record holder Keni Harrison finished second to clinch silver and the bronze to Jamaica's Megan Tapper.
The women's 400 metres hurdles event at the 2020 Summer Olympics took place between 31 July and 4 August 2021 at the Japan National Stadium. 39 athletes from 25 nations competed.
The men's marathon event at the 2020 Summer Olympics started at 07:00 on 8 August 2021 in Sapporo, Japan. 106 athletes from 46 nations competed. The previous Olympic champion, Kenyan Eliud Kipchoge, successfully defended his title, with Dutch and Belgian athletes Abdi Nageeye and Bashir Abdi gaining silver and bronze, respectively. Kipchoge was the third man to repeat as Olympic marathon champion, after Abebe Bikila and Waldemar Cierpinski. The Netherlands and Belgium earned their first men's marathon medals since 1980 and 1976, respectively.
The women's marathon event at the 2020 Summer Olympics started at 06:00 on 7 August 2021 in Sapporo. Peres Jepchirchir of Kenya won gold in 2:27:20 followed by world record holder and Kenyan teammate Brigid Kosgei with silver, and American Molly Seidel winning the bronze medal in her third-ever marathon.
The men's 20 kilometres walk event at the 2020 Summer Olympics took place on 5 August 2021 in Sapporo. Approximately 60 athletes competed; the exact number was dependent on how many nations use universality places to enter athletes in addition to the number qualifying through time. The reigning champion was Wang Zhen of China.
The men's 50 kilometres walk event at the 2020 Summer Olympics took place on 6 August 2021 in Sapporo. 59 athletes competed; the exact number was dependent on how many nations use universality places to enter athletes in addition to the number qualifying through time.
The women's triple jump event at the 2020 Summer Olympics took place between 30 July and 1 August 2021 at the Japan National Stadium.
The women's high jump event at the 2020 Summer Olympics took place on 5 and 7 August 2021 at the Japan National Stadium. Even though 32 athletes qualified through the qualification system for the Games, only 31 took part in the competition. This was the 22nd appearance of the event, having appeared at every Olympics since women's athletics was introduced in 1928.
The women's shot put event at the 2020 Summer Olympics took place on 30 July and 1 August 2021 at the Japan National Stadium. Approximately 35 athletes are expected to compete; the exact number will depend on how many nations use universality places to enter athletes in addition to the 32 qualifying through distance or ranking.
The men's discus throw event at the 2020 Summer Olympics took place between 30 and 31 July 2021 at the Japan National Stadium. Approximately 35 athletes were expected to compete; the exact number depended on how many nations use universality places to enter athletes in addition to the 32 qualifying through distance or ranking. 32 athletes from 24 nations competed. Daniel Ståhl of Sweden won gold, with his countryman Simon Pettersson earning silver. It was the first victory in the event for Sweden and the first men's discus throw medal of any color for the nation since 1972. Lukas Weißhaidinger took Austria's first-ever Olympic in the men's discus with his bronze.
The men's hammer throw event at the 2020 Summer Olympics took place between 2 and 4 August 2021 at the Japan National Stadium. Approximately 35 athletes were expected to compete; the exact number was dependent on how many nations used universality places to enter athletes in addition to the 32 qualifying through distance or ranking. 31 athletes from 21 nations competed. Wojciech Nowicki of Poland won the gold medal, adding to his 2016 bronze to become the 15th man to earn multiple hammer throw medals. It was Poland's second gold medal in the event, after Szymon Ziółkowski's 2000 victory. Nowicki's countryman Paweł Fajdek took bronze. Between them was Norwegian thrower Eivind Henriksen, with his silver being Norway's first-ever Olympic medal in the men's hammer.
The women's hammer throw event at the 2020 Summer Olympics took place on 1 and 3 August 2021 at the Japan National Stadium. Approximately 35 athletes competed; the exact number was dependent on how many nations use universality places to enter athletes in addition to the 32 qualifying through distance or ranking.
The women's javelin throw event at the 2020 Summer Olympics took place on 3 and 6 August 2021 at the Japan National Stadium. Approximately 35 athletes competed; the exact number was dependent on how many nations use universality places to enter athletes in addition to the 32 qualifying through distance or ranking.
The men's decathlon event at the 2020 Summer Olympics took place on 4 and 5 August 2021 at the Japan National Stadium. 23 athletes competed.
The women's heptathlon event at the 2020 Summer Olympics took place on 4 and 5 August 2021 at the Japan National Stadium. 24 athletes competed.
