100 metres at the Olympics

The 100 metres at the Summer Olympics has been contested since the first edition of the multi-sport event. The men's 100 metres has been present on the Olympic athletics programme since 1896. The 100 metres is considered one of the blue ribbon events of the Olympics and is among the highest profile competitions at the games. It is the most prestigious 100 metres race at elite level and is the shortest sprinting competition at the Olympics – a position it has held at every edition except for a brief period between 1900 and 1904, when a men's 60 metres was contested.

The first Olympic champions were Thomas Burke in the men's category and, 32 years later, Betty Robinson in the women's category. The Olympic records for the event are 9.63 seconds, set by Usain Bolt in 2012, and 10.61 seconds, set by Elaine Thompson-Herah in 2021. The world records for the event have been equalled or broken during the Olympics on seven occasions in the men's category and on twelve occasions in the women's.

Among the competing nations, the United States has had the most success in this event, having won sixteen golds in the men's race and nine in the women's race. Usain Bolt of Jamaica has won three consecutive titles (2008–16). Five other athletes have won back-to-back titles: Wyomia Tyus (1964–68), Carl Lewis (1984–88), Gail Devers (1992–96), Shelly-Ann Fraser-Pryce (2008–12), and Elaine Thompson-Herah (2016-2020). Merlene Ottey is the only athlete to win three medals without winning gold, with one silver and two bronze medals. Shelly-Ann Fraser-Pryce is the most decorated athlete in the event, male or female, having won 4 medals.

Many athletes that compete in this event also compete individually in the Olympic 200 metres and with their national teams in the Olympic 4×100 metres relay, with Jamaicans Usain Bolt and Elaine Thompson-Herah being the only athletes to do so more than once. Nine men have achieved the 100 metres and 200 metres 'Double' at the same Olympic Games - Archie Hahn (1904), Ralph Craig), Percy Williams (1928), Eddie Tolan (1932), Jesse Owens (1936), Bobby Morrow (1956), Valeriy Borzov (1972), Carl Lewis (1984), and Usain Bolt (2008, 2012, 2016). Four of these men were also members of the winning team in the 4x100 meters relay at the same games - Jesse Owens (1936), Bobby Morrow (1956), Carl Lewis (1984), and Usain Bolt (2012, 2016). Two of these men have won a fourth gold medal at the same games - Archie Hahn in the now defunct 60 metres, and both Jesse Owens and Carl Lewis in the long jump.

Seven women have achieved the 100 metres and 200 metres 'Double' at the same Olympic Games - Fanny Blankers-Koen (1948), Marjorie Jackson (1952), Betty Cuthbert (1956), Wilma Rudolph (1960), Renate Stecher (1972), Florence Griffith-Joyner (1988), and Elaine Thompson-Herah (2016) and (2021). Five of these women were also members of the winning team in the 4x100 meters relay at the same games - Fanny Blankers-Koen (1948), Betty Cuthbert (1956), Wilma Rudolph (1960), Florence Griffith-Joyner (1988) and Elaine Thompson-Herah (2021). Fanny Blankers-Koen is the only one of these women to win four gold medals at the same games by winning the 80 metres hurdles in 1948.

Competition format

The Olympic 100 metres competitions are carried out under standard international rules, as set by the International Association of Athletics Federations (IAAF). The races are segregated by gender, with one for men and one for women. The 100 m is usually held at the beginning of the Olympic athletics programme as this allows athletes to compete in other events held later at the games – many 100 m athletes also compete in the 200 metres and the 4×100 metres relay events.

Traditionally there are four rounds of competition: heats, quarter-finals, semi-finals, and finals. Prior to 1964, finals featured six athletes. For all Olympic competitions from 1964 onwards—allowing for a sufficient number of athletes being present—each race features eight runners. Athletes are seeded by past performance to ensure an even balance of quality across the heats and allow the best runners to progress to the later stages. Usually in the first two rounds the top three runners progress to the next stage. A small number of other athletes also progress as the fastest non-qualifiers (or "fastest losers") through a repechage system. Prior to 2012, the semi-finals stage comprised two races of eight athletes and the top four finishers in each race (regardless of time) were entered into the final.100m competition format
London 2012 (archived). Retrieved on 2014-02-01.

Several amendments were made to the competition format in 2012. Any participant not in possession of an Olympic qualifying standard time is entered into the preliminary round. Qualifiers in this round progress to the first round proper. The semi-finals stage is divided into three races: the top two progress to the final by right and the two fastest non-qualifiers complete the eight finalists. Changes to the international false start rules were also introduced – any validly recorded reaction time to the starter's pistol of below 0.1 seconds will result in instant disqualification. At the 2004 and 2008 Olympics one false start was allowed per race, with any subsequent false start resulting in disqualification for the offending athletes. At Olympics prior to 2004 each athlete was allowed one false start, with a second false start leading to removal from the field.

The top three finishers in the final are awarded a gold, silver and bronze medal, respectively. If runners cannot be separated by their time (recorded to one hundredth of a second) further analysis is used to distinguish their times to the thousandth of a second. In the 2008 Women's 100 m final the minor medallists Sherone Simpson and Kerron Stewart could not be separated by this method and were both awarded the silver medal. Medal positions in a 100 m race have only been shared on one other occasion in Olympic history: Alajos Szokolyi and Francis Lane were joint third at the 1896 men's final.

Participation

Starting with 15 men from eight nations at the inaugural 1896 Olympic 100 m, participation in the event reached its peak at the 2000 Sydney Games, where 179 male and female athletes from 100 nations were present. The number of competitors and nations in the event has seen an increasing historical trend. This increase has been mostly linear, though participation was affected by the Olympic boycotts of 1976, 1980 and 1984. The linear trend stopped after the 2000 peak and has steadily decreased in subsequent Summer Olympics.

Men's participation reached its highest at the 1996 Atlanta Olympics, which featured 104 men from 75 nations. Women's participation began in 1928, with 31 women from 13 nations competing, and reached an all-time high at the 2008 Beijing Games, which had 85 women representing 69 nations. The 2008 and 2012 editions reversed the historical gender bias towards male participation, as women outnumbered men at the Olympic 100 m for the first time.

As the governing body for the sport of athletics, the International Association of Athletics Federations (IAAF) applies qualifying standards to the competition. This aims to encourage high level performances at the Olympic Games and contain the number of potential entries (the IAAF aims to cap Olympic participation in athletics events at 2000 athletes). There are two types of qualifying standard: the "A" standard and the "B" standard. Each National Olympic Committee (NOC) may enter up to three athletes who have obtained the "A" standard, or one athlete with the "B" standard. If a NOC has no qualifying athletes in any Olympic athletic event, it may enter one non-qualified athlete – the 100 m is a frequent choice for this type of entry given the brevity of the event. Athletes must achieve the qualifying time without wind-assistance at an officially authorised event within a certain time period, which typically begins from the year prior to the Olympics and extends up to three weeks before the games. The IAAF prohibits entrants who do not reach the age of sixteen in that Olympic year, but there is no upper age limit. The IAAF qualifying standards for the 100 m have become progressively more stringent since 2000.

On top of IAAF standards, national governing bodies may apply their own participation restrictions. These principally come in four forms: stricter national qualifying times, reduced time periods for qualifying performances, performances in the event at a national Olympic trials, and decisions of national selection committees. Smaller nations do not typically apply these additional criteria due to the smaller numbers of sprinters eligible to compete. Larger nations, and nations with strong traditions in sprinting, often have long-running histories of Olympic 100 m trials (such as at the United States Olympic Trials). Participation for a country also demands that the athlete hold respective citizenship and is not subject to a competitive ban through anti-doping rules.

World Athletics in 2019 announced that, following the inauguration of their World Rankings platform, that in addition to those who achieved the Olympic standard, placing in the top 32 of the rankings will serve as a qualification method for athletes. (For example, if someone comes 3rd in the 100m finals of their national championships in 10.14, if he is 22nd in the World Rankings, he has qualified for the games).

;Data notes
*Numbers do not include non-starting athletes. There have been two Olympic 100 m non-starters: Estonia's Reinhold Saulmann in 1920, and Kim Collins in 2012 – the latter was banned from competing by the St. Kitts and Nevis Olympic Committee for defying their orders and leaving the Olympic camp to stay with his wife.
*Nations are above defined as the competing Olympic team as opposed to athletes' legal nationalities – the various Unified teams and Independent Olympian teams are thus each treated as one nation at that Olympic Games.

Biological factors

Age

The 100 m requires a high level of athleticism and as a result most of the participants in the Olympics are aged between 18 and 35 – which is roughly contiguous with the period of peak physical fitness in humans. Consequently, the vast majority of participants in the Olympic 100 m fall within this age range. As of 2020, the qualification rules prohibit athletes younger than 16 at the end of the year of the Games.

The record for the youngest athlete to participate in the Olympic 100 m is held by Katura Marae, who was 14 when she represented Vanuatu at the 2004 Athens Olympics.Katura Marae
Sports Reference. Retrieved on 2014-02-01. Merlene Ottey holds the records for both the oldest participant and the oldest medallist, having won bronze at age 40 in 2000 and reached the Olympic semi-finals four years later. (Ottey is also the most frequent participant having competed in the Olympic 100 m an unrivalled six times from 1984 to 2004).Merlene Ottey-Page
Sports Reference. Retrieved on 2014-02-01. The first women's champion, Betty Robinson in 1928, remains the youngest gold medallist for the event at 16 years old,Betty Robinson
Sports Reference. Retrieved on 2014-02-01. while a 32-year-old Linford Christie became the oldest 100 m Olympic champion in 1992.Linford Christie
Sports Reference. Retrieved on 2014-02-01.

Gender

Since introduction of testing by the IAAF in the early-20th century, female sprinters may be subject to gender verification. This rule was first formally applied to the 100 m at the 1968 Mexico Olympics. No 100 m sprinter has been publicly barred at an Olympic competition. However, there have been historic cases involving two women's medallists: 1932 champion Stanisława Walasiewicz and 1964 bronze medallist Ewa Kłobukowska