| Unofficial South American Championships in Athletics | |
| Size: | 200px |
| Host City: | Montevideo, Uruguay  |
| Dates: | May 8–10 |
| Events: | 20 |
| Level: | Senior |
| Previous: | 1931 Buenos Aires |
| Next: | 1933 Montevideo |
Unofficial South American Championships in Athletics were held in Montevideo, Uruguay on May 8–10, 1931. The event was held in celebration of the 100th anniversary of Uruguayan independence.
Medal winners are published.
| 100 metres | 10.8 | 11.0 | |||||
| 200 metres | 22.0 | 22.4 | |||||
| 400 metres | 49.2 | 50.4 | |||||
| 800 metres | 1:57.0 | ||||||
| 1500 metres | 4:07.4 | ||||||
| 3000 metres | 8:44.2 | 8:54.8 | |||||
| 5000 metres | 15:14.2 | 15:26.8 | |||||
| 10,000 metres | 31:18.8 | ||||||
| 110 metres hurdles | 16.0 | 16.2 | |||||
| 400 metres hurdles | 56.2 | 56.8 | |||||
| High jump | 1.80 | 1.80 | 1.75 | ||||
| Pole vault | 3.80 | 3.70 | 3.60 | ||||
| Long jump | 7.08 | 6.705 | 6.655 | ||||
| Triple jump | 14.305 | 14.215 | 14.055 | ||||
| Shot put | 13.33 | 13.065 | 12.10 | ||||
| Discus throw | 41.135 | 40.645 | ??? | ||||
| Hammer throw | 47.255 | 45.475 | 44.785 | ||||
| Javelin throw | 58.125 | 57.645 | 54.53 | ||||
| 4 × 100 metres relay | 42.8 | 43.2 | |||||
| 4 × 400 metres relay | 3:25.0 |