| Event: | 2003 Copa Sudamericana |
| Team1: | River Plate |
| Team2: | Cienciano |
| Team1score: | 3 |
| Team2score: | 4 |
| Team1score1: | 3 |
| Team2score1: | 3 |
| Team1score2: | 0 |
| Team2score2: | 1 |
| Firstleg: | First leg |
| Secondleg: | Second leg |
| Details: | on aggregate |
| Date1: | 10 December 2003 |
| Date2: | 19 December 2003 |
| Stadium1: | Estadio Monumental |
| Stadium2: | Estadio Universidad de San Agustín |
| City1: | Buenos Aires |
| City2: | Arequipa |
| Referee1: | Carlos Eugênio Simon (Brazil) |
| Referee2: | Gustavo Méndez (Uruguay) |
| Previous: | 2002 |
| Next: | 2004 |
The 2003 Copa Sudamericana finals was a two-legged football match, contested between Argentine club River Plate and Peruvian side Club Sportivo Cienciano to determine the champion of the 2003 Copa Sudamericana.
In the first leg, held in Estadio Monumental in Buenos Aires, both teams tied 3–3. In the second leg held in Estadio Universidad de San Agustín in Arequipa, Cienciano won 1–0 and therefore the Peruvian squad crowned champion of the competition after winning 4–1 on points (4–3 on aggregate).[1] [2] [3]
| Team | Previous finals app. | |
|---|---|---|
| None | ||
| None |
| River Plate | Round | Cienciano | ||||||
|---|---|---|---|---|---|---|---|---|
| Opponent | Agg. | 1st leg | 2nd leg | Opponent | Agg. | 1st leg | 2nd leg | |
| Bye | Preliminary stage | Alianza Lima | 2–0 | 1–0 (H) | 1–0 (A) | |||
| Independiente | 8–1 | 4–1 (A) | 4–0 (H) | Second stage | Universidad Católica | 5–3 | 4–0 (H) | 1–3 (A) |
| Libertad | 2–1 | 2–0 (H) | 0–1 (A) | Quarter-finals | Santos | 3–2 | 1–1 (A) | 2–1 (H) |
| São Paulo | 3–3 (p) | 3–1 (H) | 0–2 (A) (a.e.t.) | Semi-finals | Atlético Nacional | 3–1 | 2–1 (A) | 1–0 (H) |
| GK | 1 | |||
| DF | 15 | |||
| DF | 2 |  Santiago Acasiete | ||
| DF | 5 | Carlos Lugo | ||
| DF | 13 | Giuliano Portilla | ||
| MF | 8 | |||
| MF | 14 | |||
| MF | 10 | |||
| MF | 16 | |||
| FW | 19 | |||
| FW | 9 | |||
| Substitutions: | ||||
| MF | 6 | César Ccahuantico | ||
| DF | 3 | Martín García | ||
| MF | 17 | Miguel Llanos | ||
| Manager: | ||||
| Freddy Ternero | ||||
| GK | 17 | |||
| DF | 21 |  Horacio Ameli | ||
| DF | 25 | |||
| DF | 13 | Ricardo Rojas | ||
| MF | 8 | |||
| MF | 15 | |||
| MF | 2 | |||
| MF | 24 | |||
| MF | 16 | |||
| FW | 11 | |||
| FW | 23 | |||
| Substitutions: | ||||
| MF | 10 | |||
| FW | 7 | |||
| MF | 22 | Daniel Ludueña | ||
| Manager: | ||||
| Manuel Pellegrini | ||||