| V South American Junior Championships in Athletics | |
| Size: | 200px |
| Host City: | Santiago, Chile  |
| Dates: | September 24–27 |
| Nations Participating: | 7 |
| Athletes Participating: | about 80 |
| Events: | 19 |
| Level: | Junior |
| Previous: | 1962 Lima |
| Next: | 1966 Montevideo |
The fifth South American Junior Championships in Athletics were held in Santiago, Chile from September 24–27, 1964.
Detailed result lists can be found on the "World Junior Athletics History" website. An unofficial count yields the number of about 80 athletes from about 7 countries: Argentina (20), Brazil (10), Chile (18), Ecuador (2), Peru (8), Uruguay (6), Venezuela (16).
Medal winners are published for men and womenComplete results can be found on the "World Junior Athletics History" website.
| 100 metres | 10.5 | 10.6 | 10.8 | ||||
| 200 metres | 21.5 | 21.7 | 21.8 | ||||
| 400 metres | 48.7 | 48.9 | 49.1 | ||||
| 800 metres | 1:55.3 | 1:56.4 | 1:56.5 | ||||
| 1500 metres | 4:06.7 | 4:09.2 | 4:10.0 | ||||
| 3000 metres | 9:04.6 | 9:09.6 | 9:13.4 | ||||
| 110 metres hurdles | 15.3 | 15.7 | 16.0 | ||||
| 400 metres hurdles | 54.8 | 55.2 | 57.6 | ||||
| High jump | 1.96 | 1.93 | 1.85 | ||||
| Pole vault | 3.85 | 3.70 | 3.60 | ||||
| Long jump | 7.49 | 7.11 | 6.95 | ||||
| Triple jump | 13.77 | 13.65 | 13.65 | ||||
| Shot put | 16.56 | 15.90 | 14.22 | ||||
| Discus throw | 43.39 | 39.25 | 38.06 | ||||
| Hammer throw | 49.76 | 49.14 | 49.12 | ||||
| Javelin throw | 62.11 | 60.62 | 55.66 | ||||
| Pentathlon | 2622 | 2542 | 2348 | ||||
| 4 × 100 metres relay | 41.4 | 41.8 | 42.2 | ||||
| 4 × 400 metres relay | 3:19.8 | 3:21.2 | 3:23.2 |