| FIBA South America Under-21 Championship | |
| Current Season: | 2019 FIBA Under-21 South America Championship |
| Sport: | Basketball |
| Continent: | South America |
| Website: | FIBA.com |
| Related Comps: | FIBA Under-21 World Championship |
| Founder: | FIBA Americas |
The South American Under-21 Championship for Men is a sporadically held basketball tournament. With the FIBA Americas Under-21 Championship having not been held since 2004 and no plans to hold it in the near future, this tournament's future is in doubt. The 2004 iteration was the fourth time the tournament had been held as either an under-22 or under-21 tournament.