| Tourney Name: | Copa Nissan Sudamericana |
| Year: | 2004 |
| Other Titles: | 2004 Copa Nissan Sudamericana de Clubes 2004 Copa Nissan Sul-americana do Clubes |
| Size: | 200px |
| Dates: | August 10 - December 17 |
| Num Teams: | 35 |
| Associations: | 10 |
| Champion Other: |  Boca Juniors |
| Count: | 1 |
| Second Other: |  Bolívar |
| Matches: | 68 |
| Goals: | 174 |
| Top Scorer: | Horacio Chiorazzo (5) |
| Prevseason: | 2003 |
| Nextseason: | 2005 |
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.
|-!colspan="5"|Argentina 3A Preliminary|-!colspan="5"|Argentina 4A Preliminary|}
|-!colspan="5"|Brazil 1A Preliminary|-!colspan="5"|Brazil 2A Preliminary|-!colspan="5"|Brazil 3A Preliminary|-!colspan="5"|Brazil 4A Preliminary|}
|-!colspan="5"|Brazil 5A Preliminary|-!colspan="5"|Brazil 6A Preliminary|-!colspan="5"|Brazil 7A Preliminary|-!colspan="5"|Brazil 8A Preliminary|}
|-!colspan="5"|Venezuela Preliminary|}
|-!colspan="5"|Venezuela/Cienciano Preliminary|-!colspan="5"|Ecuador Preliminary|}
|-!colspan="5"|Chile Preliminary|-!colspan="5"|Bolivia Preliminary|}
|-!colspan="5"|Colombia Preliminary|-!colspan="5"|Peru Preliminary|}
|-!colspan="5"|Paraguay Preliminary|-!colspan="5"|Uruguay Preliminary|}
|-!colspan="5"|Quarterfinalist 4|-!colspan="5"|Quarterfinalist 6|}
|-!colspan="5"|Quarterfinalist 2|-!colspan="5"|Quarterfinalist 7|}
|-!colspan="5"|Quarterfinalist 8|}
|-!colspan="5"|Quarterfinalist 5|}
|-!colspan="5"|Quarterfinalist 1|}
|-!colspan="5"|Quarterfinalist 3|}
|}
|}
See main article: 2004 Copa Sudamericana Finals.
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