Dominica at the 2012 Summer Olympics first round of their respective events. Dominica participated in five Summer Olympic Games between its debut at the 1996 Summer Olympics in Atlanta, United States and the 2012 Summer Olympics in London, England. The highest number of athletes sent by Dominica to a Summer Games is six to the 1996 Olympics. No Dominican athlete has ever won a medal at the Olympic Games. Dominica participated in the London Summer Games from 27 July to 12 August 2012. The Dominican National Olympic Committee (NOC) selected two athletes through qualification standards. An NOC would be able to enter up to three qualified
Brunei at the 2012 Summer Olympics they failed to meet the required qualifying times for their events. Mahusin was the flag bearer for the opening ceremony while Lim held it at the closing ceremony. All three athletes failed to advance beyond the heat stages of their respective events, but Mahusin and Lim achieved new national records in athletics and swimming. Although Brunei first participated in the Summer Olympics in the 1988 Summer Olympics in Seoul, South Korea, it was only represented by one official. It would not be until the 1996 Summer Olympics in Atlanta, United States that the country would send athletes to the Games.