| 1991 South American Championships in Athletics | |
|---|---|
| Dates | 28–30 June |
| Host city | Manaus, Brazil |
| Venue | Vila Olímpica de Manaus |
| Events | 41 |
| Participation | 257 athletes from 11 nations |
The 36th South American Championships in Athletics were held in Manaus, Brazil, between 28 and 30 June 1991. It was the last edition to hold the Marathon event.