| Tourney Name: | Copa Libertadores de América |
| Year: | 2003 |
| Other Titles: | 2003 Copa Toyota Libertadores de América 2003 Copa Toyota Libertadores da América |
| Dates: | 4 February – 2 July |
| Num Teams: | 32 |
| Associations: | 11 |
| Champion Other: |  Boca Juniors |
| Count: | 5 |
| Second Other: |  Santos |
| Matches: | 126 |
| Goals: | 371 |
| Top Scorer: | Marcelo Delgado Ricardo Oliveira (9 goals each) |
| Player: | Carlos Tevez[1] [2] |
| Prevseason: | 2002 |
| Nextseason: | 2004 |
The 2003 Copa Libertadores de América (officially the 2003 Copa Toyota Libertadores de América for sponsorship reasons) was the 44th edition of the Copa Libertadores, CONMEBOL's premier annual international club tournament.
The tournament was won by Boca Juniors after defeating Santos in a rematch of the 1963 Copa Libertadores Finals. With this title, Boca Juniors achieved their fifth Copa Libertadores title and third in four years.
From 1998 to 2002, Mexican and Venezuelan clubs played a mini tournament known as Copa Pre Libertadores to determine two teams that would qualify to the next year's Copa Libertadores group stage. In 2002 UNAM participated in the Pre Libertadores trying to earn a spot in the 2003 edition of the tournament.[3]
|}
|}
|}
See main article: 2003 Copa Libertadores Finals.