Athletes from 140 nations competed at the Los Angeles Games. The following countries made their first Olympic appearance in 1984: Bahrain, Bangladesh, Bhutan, British Virgin Islands, Djibouti, Equatorial Guinea, Gambia, Grenada, Mauritania, Mauritius, North Yemen, Oman, Qatar, Rwanda, Samoa, Solomon Islands, Tonga, and the United Arab Emirates. The People's Republic of China made their first appearance in a Summer Olympics since 1952, while for the first time the Republic of China team participated as Chinese Taipei.

the are more countries won mor medals for example united states won 56 medal en total and germany sweden or rumania win more medal that throughout its history