| Location: | São Paulo, |
| Next: | 1967 |
| Main: | Overall medal table |
| Previous: | 1959 |
| Award1 Type: | Most gold medals |
| Award2 Type: | Most total medals |
The 1963 Pan American Games, officially known as the IV Pan American Games, were a continental multi-sport event held in São Paulo, Brazil, from April 20 to May 5, 1963. At the Games, 1,665 athletes selected from 22 National Olympic Committees (NOCs) participated in events in 19 sports. Eighteen nations earned medals during the competition and eleven won at least one gold. Barbados, debuting at the Pan American Games, won its first medals (three bronze), while British Guiana won its first ever gold medal. Colombia, Costa Rica, the Dominican Republic, Haiti, Nicaragua and Paraguay did not send athletes to São Paulo, making it the Games with the lowest number of competitors in history.
Brazil, Canada, Cuba, Guatemala, the Netherlands Antilles, Puerto Rico, Trinidad and Tobago, Uruguay and Venezuela improved their position in the general medal table compared to the 1959 Pan American Games. The United States led the medal count, winning a total of 199 medals (106 gold, 56 silver and 37 bronze). Competitors from the host nation, Brazil, won 14 gold medals, 20 silver medals and 18 bronze medals, finishing the Games in second and marking the country's best performance to date, as well as its highest-ever position in the medal table.
Judo made its debut in the Pan American Games. Brazil, as the host, was allowed to compete in all sports, bringing 385 athletes to the Games. Brazilians won more medals in boxing than in any other sport (three gold, five silver and one bronze), followed by athletics (two silver and six bronze) and tennis (three gold).
The ranking in this table is based on medal counts published by several media organizations and according to information provided by some NOCs, such as the Brazilian Olympic Committee (BOC). However, there were no details regarding the number of events or the discrepancy between the number of gold, silver and bronze medals. By default, the table is ordered by the number of gold medals won by the athletes representing a nation. (In this context, a nation is an entity represented by a NOC). The number of silver medals is taken into consideration next and then the number of bronze medals. If nations are still tied, equal ranking is given and they are listed alphabetically by IOC country code.