The 2004 Copa Nissan Sudamericana was the 3rd edition of CONMEBOL's secondary international football tournament. It was won by Argentine club Boca Juniors, who defeated Bolívar of Bolivia to win their first title.

First stage

Argentina Preliminary

!colspan="5"|Argentina 3A Preliminary !colspan="5"|Argentina 4A Preliminary

Brazil Preliminary

First round

!colspan="5"|Brazil 1A Preliminary !colspan="5"|Brazil 2A Preliminary !colspan="5"|Brazil 3A Preliminary !colspan="5"|Brazil 4A Preliminary

Second round

!colspan="5"|Brazil 5A Preliminary !colspan="5"|Brazil 6A Preliminary !colspan="5"|Brazil 7A Preliminary !colspan="5"|Brazil 8A Preliminary

Ecuador/Cienciano/Venezuela Preliminary

First round

!colspan="5"|Venezuela Preliminary

Second round

!colspan="5"|Venezuela/Cienciano Preliminary !colspan="5"|Ecuador Preliminary

Chile/Bolivia Preliminary

!colspan="5"|Chile Preliminary !colspan="5"|Bolivia Preliminary

Colombia/Peru Preliminary

!colspan="5"|Colombia Preliminary !colspan="5"|Peru Preliminary

Paraguay/Uruguay Preliminary

!colspan="5"|Paraguay Preliminary !colspan="5"|Uruguay Preliminary

Second stage

Argentina Zone

!colspan="5"|Quarterfinalist 4 !colspan="5"|Quarterfinalist 6

Brazil Zone

!colspan="5"|Quarterfinalist 2 !colspan="5"|Quarterfinalist 7

Ecuador/2003 Champion/Venezuela Zone

!colspan="5"|Quarterfinalist 8

Chile/Bolivia Zone

!colspan="5"|Quarterfinalist 5

Colombia/Peru Zone

!colspan="5"|Quarterfinalist 1

Paraguay/Uruguay Zone

!colspan="5"|Quarterfinalist 3

Bracket

Quarterfinals

Semifinals

Finals