| Spanish; Castilian: 8° Campeonato Sudamericano de Rugby | |
| Host: | Brazil |
| Champion: | Argentina |
| Runnerup: | Uruguay |
| Matches: | 10 |
| Countries: | |
| Preceded By: | 1971 |
| Succeeded By: | 1975 |
See main article: South American Rugby Championship.
The 1973 South American Rugby Championship was the eighth edition of the competition of the leading national Rugby Union teams in South America.
The tournament was played in San Paolo and won by Argentina.
| 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 | 309 | 6 | + 303 | 8 | ||||||||||
| 4 | 3 | 0 | 1 | 60 | 80 | - 20 | 6 | ||||||||||
| 4 | 2 | 0 | 2 | 62 | 79 | - 17 | 4 | ||||||||||
| 4 | 1 | 0 | 3 | 31 | 137 | - 106 | 2 | ||||||||||
| 4 | 0 | 0 | 4 | 18 | 178 | - 160 | 0 |
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