The 1984 Summer Olympics, officially known as the Games of the XXIII Olympiad, were an international multi-sport event held in Los Angeles, California, United States, from 28 July to 12 August 1984. These Games had 6,829 athletes from 140 NOCs participating in a total of 221 events in 23 sports. Athletes from 47 NOCs won medals, of which 25 secured at least a gold medal. As a result, 93 NOCs were left without any medal. The host NOC, the United States, received 83 gold medals, breaking the previous Summer Olympic record of 78 golds, set at the 1904 Summer Olympics. Even so, the United States still won fewer medals than the previous overall record.
Seventeen NOCs chose not to compete at the 1984 Summer Olympics, including fourteen NOCs in a Soviet Union-led boycott. Four years earlier, 61 NOCs – led by the United States – had boycotted the 1980 Summer Olympics staged in Moscow. Nonetheless, Romania, China and Yugoslavia – at the time, ruled by Communist governments – decided to compete in Los Angeles, and finished second, fourth and ninth in the medal standings. In addition, three countries unrelated to the Soviet boycott decided not to compete. Libya withdrew from the competition when two journalists were refused entry to the United States, while Iran boycotted the Games over the United States' support for Israel and "the crimes being committed by the U.S.A. in Latin America, especially in El Salvador." Angola also boycotted the Games, but made no statement as to their reasons. USA officials believed that Angola's withdrawal was related to Soviet financial and political support of the ruling MPLA.
The ranking in this table is based on information provided by the International Olympic Committee (IOC) and is consistent with IOC convention in its published medal tables. By default, the table is ordered by the number of gold medals the athletes from a National Olympic Committee have won (a nation is represented at a Games by the associated National Olympic Committee). The number of silver medals is taken into consideration next and then the number of bronze medals. If NOCs are still tied, equal ranking is given and they are listed alphabetically by IOC country code.