Olympic Games: The Games of the XIV Olympiad: After a hiatus of 12 years caused by World War II, the first Summer Olympics to be held since the 1936 Summer Olympics in Berlin, open in London.

The 1948 Summer Olympics (officially the Games of the XIV Olympiad and also known as London 1948) were an international multi-sport event held from 29 July to 14 August 1948 in London, England, United Kingdom. Following a twelve-year hiatus caused by the outbreak of World War II, these were the first Summer Olympics held since the 1936 Games in Berlin. The 1940 Olympic Games had been scheduled for Tokyo and then for Helsinki, while the 1944 Olympic Games had been provisionally planned for London. This was the second time London had hosted the Olympic Games, having previously hosted them in 1908, forty years earlier. The Olympics would again return to London 64 years later in 2012, making London the first city to have hosted the games three times, and the only such city until Paris and Los Angeles host their third games in 2024 and 2028, respectively. The 1948 Olympic Games were also the first of two summer Games held under the IOC presidency of Sigfrid Edstrm.

The 1948 Olympics came to be known as the "Austerity Games" due to the difficult economic climate and rationing imposed in the aftermath of World War II. No new venues were built for the games (with events taking place mainly at Wembley Stadium, also known as Empire Stadium, and the Empire Pool at Wembley Park), and athletes were housed in existing accommodation at the Wembley area instead of an Olympic Village, as were the 1936 Games and the subsequent 1952 Games in Helsinki. A record 59 nations were represented by 4,104 athletes, 3,714 men, and 390 women in 19 sport disciplines. Germany and Japan were not invited to participate in the games; the Soviet Union was invited but chose not to send any athletes, sending observers instead to prepare for the 1952 Olympics.

One of the star performers at the 1948 Games was Dutch sprinter Fanny Blankers-Koen. Dubbed the "Flying Housewife", the thirty-year-old mother of two won four gold medals in athletics. In the decathlon, Bob Mathias of the United States became the youngest male ever to win an Olympic track and field gold medal at the age of seventeen. The most individual medals were won by Veikko Huhtanen of Finland, who took three golds, a silver and a bronze in men's gymnastics. The United States won the most gold and overall medals, having 300 athletes compared to the United Kingdom's 404. France fielded the second largest team, with 316 athletes and finished third in the medal standings. The host nation ended up twelfth.

The modern Olympic Games or Olympics (French: Jeux olympiques) are the leading international sporting events featuring summer and winter sports competitions in which thousands of athletes from around the world participate in a variety of competitions. The Olympic Games are considered the world's foremost sports competition with more than 200 nations participating. The Olympic Games are normally held every four years, alternating between the Summer and Winter Olympics every two years in the four-year period.

Their creation was inspired by the ancient Olympic Games (Ancient Greek: Ὀλυμπιακοί Ἀγῶνες), held in Olympia, Greece from the 8th century BC to the 4th century AD. Baron Pierre de Coubertin founded the International Olympic Committee (IOC) in 1894, leading to the first modern Games in Athens in 1896. The IOC is the governing body of the Olympic Movement, with the Olympic Charter defining its structure and authority.

The evolution of the Olympic Movement during the 20th and 21st centuries has resulted in several changes to the Olympic Games. Some of these adjustments include the creation of the Winter Olympic Games for snow and ice sports, the Paralympic Games for athletes with disabilities, the Youth Olympic Games for athletes aged 14 to 18, the five Continental games (Pan American, African, Asian, European, and Pacific), and the World Games for sports that are not contested in the Olympic Games. The IOC also endorses the Deaflympics and the Special Olympics. The IOC has needed to adapt to a variety of economic, political, and technological advancements. The abuse of amateur rules by the Eastern Bloc nations prompted the IOC to shift away from pure amateurism, as envisioned by Coubertin, to the acceptance of professional athletes participating at the Games. The growing importance of mass media has created the issue of corporate sponsorship and general commercialisation of the Games. World wars led to the cancellation of the 1916, 1940, and 1944 Olympics; large-scale boycotts during the Cold War limited participation in the 1980 and 1984 Olympics; and the 2020 Olympics were postponed until 2021 as a result of the COVID-19 pandemic.

The Olympic Movement consists of international sports federations (IFs), National Olympic Committees (NOCs), and organising committees for each specific Olympic Games. As the decision-making body, the IOC is responsible for choosing the host city for each Games, and organises and funds the Games according to the Olympic Charter. The IOC also determines the Olympic programme, consisting of the sports to be contested at the Games. There are several Olympic rituals and symbols, such as the Olympic flag and torch, as well as the opening and closing ceremonies. Over 14,000 athletes competed at the 2016 Summer Olympics and 2018 Winter Olympics combined, in 35 different sports and over 400 events. The first, second, and third-place finishers in each event receive Olympic medals: gold, silver, and bronze, respectively.

The Games have grown so much that nearly every nation is now represented; colonies and overseas territories are allowed to field their own teams. This growth has created numerous challenges and controversies, including boycotts, doping, bribery, and terrorism. Every two years the Olympics and its media exposure provide athletes with the chance to attain national and sometimes international fame. The Games also provide an opportunity for the host city and country to showcase themselves to the world.