The 2016 Summer Olympics, officially known as the Games of the XXXI Olympiad, are a major international multi-sport event to be celebrated in the tradition of the Olympic Games, as governed by the International Olympic Committee (IOC). The host city of the Games will be Rio de Janeiro, Brazil as announced at the 121st IOC Session (which is also the 13th Olympic Congress) held in Copenhagen, Denmark, on October 2, 2009. They are scheduled to be held from August 5 to 21, 2016. The 2016 Summer Paralympics will be held in the same city and organized by the same committee, and are scheduled to be held from September 7 to 18. The Rio 2016 Summer Olympic Games will be the first edition held in South America, the second in Latin America (after Mexico City), the third edition held in the southern hemisphere (the first of which outside of Australia), and the first Games in a lusophone (Portuguese-speaking) country.

The bidding process for the 2016 Summer Olympic Games was officially launched on May 16, 2007. The first step for each city was to submit an initial application to the International Olympic Committee (IOC) by September 13, 2007, confirming their intention to bid. Completed official bid files, containing answers to a 25-question IOC form, were to be submitted by each applicant city by January 14, 2008. Four candidate cities were chosen for the shortlist on June 4, 2008: Chicago, Madrid, Rio de Janeiro, and Tokyo (which hosted the 1964 Summer Olympics). The IOC did not promote Doha to the Candidature phase, despite scoring higher than selected candidate city Rio de Janeiro, due to their intent of hosting the Olympics in October, outside of the IOC's sporting calendar. Prague and Baku also failed to make the cut.

The Olympic Games (French: les Jeux olympiques) (JO), is a major international event featuring summer and winter sports, in which thousands of athletes participate in a variety of competitions. The Olympic Games have come to be regarded as the world’s foremost sports competition where more than 200 nations participate. The Games are currently held every two years, with Summer and Winter Olympic Games alternating, although they occur every four years within their respective seasonal games. Originally, the ancient Olympic Games were 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. The IOC has since become the governing body of the Olympic Movement, whose structure and actions are defined by the Olympic Charter.

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 Games for ice and winter sports, the Paralympic Games for athletes with a physical disability, and the Youth Olympic Games for teenage athletes. The IOC has had to adapt to the varying economic, political, and technological realities of the 20th century. As a result, the Olympics shifted away from pure amateurism, as envisioned by Coubertin, to allow participation of professional athletes. The growing importance of the mass media created the issue of corporate sponsorship and commercialization of the Games. World Wars led to the cancellation of the 1916, 1940, and 1944 Games. Large boycotts during the Cold War limited participation in the 1980 and 1984 Games.