Great Britain, or in full Great Britain and Northern Ireland, represented by the British Olympic Association (BOA), competed at the 2016 Summer Olympics in Rio de Janeiro, Brazil, from 5 to 21 August 2016 and the team of selected athletes was officially known as Team GB. British athletes have appeared in every Summer Olympic Games of the modern era, alongside Australia, France, Greece, and Switzerland, though Great Britain is the only country to have won at least one gold medal at all of them. The team represented the United Kingdom, the three Crown Dependencies, and the thirteen British Overseas Territories, ten of whom sent representatives.

The United Kingdom has been represented at every modern Olympic Games, and as of the 2020 Summer Olympics is third in the all-time Summer Olympic medal table by both number of gold medals won and overall number of medals. London has hosted the Summer Olympic Games three times: in 1908, 1948, and 2012.