| Spanish; Castilian: 17° Campeonato Sudamericano de Rugby | |
| Champion: | Argentina |
| Runnerup: | Uruguay |
| Matches: | 10 |
| Countries: | |
| Preceded By: | 1989 |
| Succeeded By: | 1993 |
| Date: | 15 August– 1 October 1991 |
See main article: South American Rugby Championship.
The 1991 South American Rugby Championship was the 17th edition of the competition of the leading national Rugby Union teams in South America.
For the first time, the tournament wasn't played in a host country, but in different venues in each countrie participating.
| width=165 | Team | width=40 | Played | width=40 | Won | width=40 | Drawn | width=40 | Lost | width=40 | For | width=40 | Against | width=40 | Difference | width=40 | Pts |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 4 | 0 | 0 | 194 | 31 | + 163 | 8 | ||||||||||
| 4 | 3 | 0 | 1 | 109 | 70 | + 39 | 6 | ||||||||||
| 4 | 2 | 0 | 2 | 72 | 109 | - 37 | 4 | ||||||||||
| 4 | 1 | 0 | 3 | 74 | 97 | - 23 | 2 | ||||||||||
| 4 | 0 | 0 | 4 | 35 | 177 | - 142 | 0 |
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