Spanish:
* Argentina
* Bolivia
* Chile
* Colombia
* Ecuador
* Paraguay
* Peru
* Uruguay
* Venezuela
Portuguese:
* Brazil
Dutch:
* Suriname
Quechua:
* Bolivia (along with Spanish)
* Peru (along with Spanish)
* Ecuador (along with Spanish)
Aymara:
* Bolivia (along with Spanish)
* Peru (along with Spanish)
Guaraní:
* Paraguay (along with Spanish)
Note:
* Guyana has English as its official language.
* French Guiana is an overseas region of France and has French as its official language.
* There are several indigenous languages spoken in various South American countries, but these are not considered official languages in most cases.
It's important to remember that even though a country has an official language, other languages are often spoken within its borders. The linguistic diversity of South America is vast and fascinating!