| XXXI South American Junior Championships in Athletics | |
| Size: | 200px |
| Host City: | Concepción, Chile  |
| Dates: | October 22–23 |
| Nations Participating: | 11 |
| Athletes Participating: | about 278 |
| Events: | 43 |
| Level: | Junior |
| Previous: | 1998 Córdoba |
| Next: | 2000 São Leopoldo |
The 31st South American Junior Championships in Athletics were held in Concepción, Chile from October 22–23, 1999.
Detailed result lists can be found on the "World Junior Athletics History" website. An unofficial count yields the number of about 278 athletes from about 11 countries: Argentina (47), Bolivia (9), Brazil (63), Chile (59), Colombia (15), Ecuador (30), Panama (4), Paraguay (4), Peru (15), Uruguay (10), Venezuela (22).
Medal winners are published for men and womenComplete results can be found on the "World Junior Athletics History" website.
| 100 metres | 10.46 | 10.58 | 10.67 | ||||
| 200 metres | 21.47 | 21.50 | 21.58 | ||||
| 400 metres | 47.28 | 48.10 | 48.24 | ||||
| 800 metres | 1:51.36 | 1:51.79 | 1:52.18 | ||||
| 1500 metres | 3:53.67 | 3:54.95 | 3:56.26 | ||||
| 5000 metres | 14:46.34 | 14:47.65 | 14:49.85 | ||||
| 10,000 metres | 30:23.08 | 30:33.16 | 31:19.16 | ||||
| 110 metres hurdles | 14.26 | 14.29 | 14.59 | ||||
| 400 metres hurdles | 51.43 | 52.67 | 53.23 | ||||
| 3000 metres steeplechase | 9:13.63 | 9:14.94 | 9:16.01 | ||||
| 4 × 100 metres relay | 40.97 | 41.46 | 41.58 | ||||
| 4 × 400 metres relay | 3:13.25 | 3:14.87 | 3:15.21 | ||||
| 10,000 metres track walk | 42:52.36 | 43:00.81 | 44:43.08 | ||||
| High jump | 2.09 | 2.06 | 2.03 | ||||
| Pole vault | 4.80 | 4.75 | 4.75 | ||||
| Long jump | 7.36 | 7.30w | 7.20 | ||||
| Triple jump | 16.18 | 15.72 | 14.99w | ||||
| Shot put | 15.78 | 15.52 | 15.39 | ||||
| Discus throw | 47.55 | 46.60 | 46.22 | ||||
| Hammer throw | 58.37 | 55.56 | 55.18 | ||||
| Javelin throw | 70.15 | 63.17 | 63.13 | ||||
| Decathlon | 6768 | 6489 | 6473 |
| 100 metres | 11.71 | 11.73 | 11.76 | ||||
| 200 metres | 23.78 | 24.10 | 24.73 | ||||
| 400 metres | 54.38 | 55.52 | 55.60 | ||||
| 800 metres | 2:06.68 | 2:07.04 | 2:07.56 | ||||
| 1500 metres | 4:31.66 | 4:33.60 | 4:35.44 | ||||
| 3000 metres | 9:34.96 | 9:40.40 | 9:46.53 | ||||
| 5000 metres | 16:47.87 | 17:07.70 | 17:15.45 | ||||
| 100 metres hurdles | 13.85 | 14.16 | 14.62 | ||||
| 400 metres hurdles | 59.12 | 60.69 | 61.91 | ||||
| 4 × 100 metres relay | 45.87 | 46.63 | 47.36 | ||||
| 4 × 400 metres relay | 3:44.40 | 3:46.60 | 3:54.64 | ||||
| 5000 metres track walk | 24:13.86 | 24:31.24 | 24:33.44 | ||||
| High jump | 1.80 | 1.73 | 1.71 | ||||
| Pole vault | 3.70 | 3.70 | 3.60 | ||||
| Long jump | 6.22 | 5.93 | 5.91 | ||||
| Triple jump | 12.88 | 12.87 | 12.62 | ||||
| Shot put | 14.16 | 13.82 | 13.04 | ||||
| Discus throw | 45.23 | 44.43 | 41.05 | ||||
| Hammer throw | 52.23 | 51.92 | 46.60 | ||||
| Javelin throw | 45.44 | 43.86 | 42.26 | ||||
| Heptathlon | 4720 | 4564 | 4285 |