| 21st South American Basketball Championship | |
|---|---|
| Tournament details | |
| Host country | Argentina |
| Dates | December 2–12 |
| Teams | 8 |
| Venue(s) | 1 (in 1 host city) |
| Final positions | |
| Champions |  Argentina (6th title) |
The South American Basketball Championship 1966 was the 20th edition of this regional tournament. It was held from December 2 to 12 in Mendoza, San Juan, Argentina. Eight teams competed.
The final standings were determined by a round robin, where the 8 teams played against each other once.
| Team | Pld | W | L | PF | PA | PD | Pts |
|---|---|---|---|---|---|---|---|
| Argentina | 7 | 6 | 1 | 500 | 353 | +147 | 13 |
 Brazil | 7 | 6 | 1 | 470 | 337 | +133 | 13 |
 Peru | 7 | 5 | 2 | 458 | 448 | +10 | 12 |
 Uruguay | 7 | 4 | 3 | 460 | 444 | +16 | 11 |
 Ecuador | 7 | 3 | 4 | 426 | 477 | −51 | 10 |
 Chile | 7 | 2 | 5 | 431 | 513 | −82 | 9 |
 Colombia | 7 | 1 | 6 | 464 | 523 | −59 | 8 |
 Paraguay | 7 | 1 | 6 | 409 | 523 | −114 | 8 |