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Below are the rosters for the 2003 South American Youth Championship tournament held in Uruguay. The ten national teams involved in the tournament were required to register a squad of 20 players. Only players in these squads were eligible to take part in the tournament.
Players' names marked in bold have been capped at full international level.
Coach: Hugo Tocalli 
| No. | Pos. | Player | Date of birth (age) | Caps | Club |
|---|---|---|---|---|---|
| 1 | GK | Gustavo Eberto | 30 August 1983 (aged 19) | Boca Juniors | |
| 2 | DF | Gonzalo Rodríguez | 10 April 1984 (aged 18) | San Lorenzo | |
| 3 | DF | Marcos Charras | 9 January 1983 (aged 19) |  CSKA Sofia | |
| 4 | DF | Mauricio Romero | 13 January 1983 (aged 19) | Lanús | |
| 5 | MF | Javier Mascherano | 8 June 1984 (aged 18) | River Plate | |
| 6 | DF | Javier Pinola | 24 February 1983 (aged 19) |  Atlético Madrid | |
| 7 | FW | Maxi López | 3 April 1984 (aged 18) | River Plate | |
| 8 | MF | Pablo Zabaleta | 16 January 1985 (aged 17) | San Lorenzo | |
| 9 | FW | Fernando Cavenaghi | 21 September 1983 (aged 19) | River Plate | |
| 10 | FW | Carlos Tevez | 5 February 1984 (aged 18) | Boca Juniors | |
| 11 | MF | Marcelo Carrusca | 1 September 1983 (aged 19) | Estudiantes | |
| 12 | GK | Lucas Molina | 30 March 1984 (aged 18) | Independiente | |
| 13 | DF | Walter García | 14 March 1984 (aged 18) | San Lorenzo | |
| 14 | DF | Joel Barbosa | 15 January 1983 (aged 19) | Boca Juniors | |
| 15 | MF | Fernando Belluschi | 10 September 1983 (aged 19) | Newell's Old Boys | |
| 16 | MF | Patricio Pérez | 27 June 1985 (aged 17) | Vélez Sársfield | |
| 17 | MF | Emanuel Rivas | 17 March 1983 (aged 19) | Independiente | |
| 18 | FW | Leonardo Pisculichi | 18 January 1984 (aged 18) | Argentinos Juniors | |
| 19 | MF | Hugo Colace | 6 January 1984 (aged 18) | Argentinos Juniors | |
| 20 | MF | Jonás Gutiérrez | 5 July 1983 (aged 19) | Vélez Sársfield |
Coach: Marcos Paqueta 
| No. | Pos. | Player | Date of birth (age) | Caps | Club |
|---|---|---|---|---|---|
| 1 | GK | Jefferson | 2 January 1983 (aged 20) | Botafogo | |
| 2 | DF | Dani Alves | 6 May 1983 (aged 19) | Sevilla | |
| 3 | DF | Alcides Eduardo | 13 March 1985 (aged 17) | Vitória | |
| 4 | DF | André Bahia | 24 November 1983 (aged 19) | Flamengo | |
| 5 | MF | Dudu Cearense | 15 April 1983 (aged 19) | Vitória | |
| 5 | MF | Carlos Alberto | 24 January 1978 (aged 24) | Figueirense | |
| 6 | DF | Jean Carlos | 12 August 1983 (aged 19) | Atlético-PR | |
| 7 | FW | Daniel Carvalho | 1 March 1983 (aged 19) | Internacional | |
| 8 | MF | Felipe Melo | 26 June 1983 (aged 19) | Flamengo | |
| 9 | FW | Élton Giovanni | 3 September 1983 (aged 19) | Grêmio | |
| 10 | MF | Carlos Alberto | 11 December 1984 (aged 18) | Fluminense | |
| 11 | FW | Dagoberto | 22 March 1983 (aged 19) | Atlético-PR | |
| 12 | GK | Fernando Henrique | 25 November 1983 (aged 19) | Fluminense | |
| 13 | DF | Jancarlos | 15 August 1983 (aged 19) | Fluminense | |
| 14 | DF | Gláuber | 5 August 1983 (aged 19) | Palmeiras | |
| 15 | DF | Michael Anderson | 5 March 1983 (aged 19) | Flamengo | |
| 16 | MF | Wendel | 25 May 1984 (aged 18) | Corinthians | |
| 17 | MF | Juninho | 11 January 1983 (aged 19) | Atlético Mineiro | |
| 18 | MF | Cleiton Xavier | 23 March 1983 (aged 19) | Internacional | |
| 19 | FW | Jussiê | 19 September 1983 (aged 19) | Cruzeiro | |
| 20 | FW | William | 14 May 1983 (aged 19) | Santos |
Coach: Cesar Vaccia 
| No. | Pos. | Player | Date of birth (age) | Caps | Goals | Club |
|---|---|---|---|---|---|---|
| 1 | GK | Miguel Pinto | July 4, 1983 (aged 19) | Universidad de Chile | ||
| 2 | DF | Enzo Vera | April 7, 1983 (aged 19) | Colo-Colo | ||
| 3 | DF | Juan Toro | May 17, 1984 (aged 18) | Magallanes | ||
| 4 | MF | Gonzalo Fierro | March 21, 1983 (aged 19) | Colo-Colo | ||
| 5 | DF | Miguel Aceval | January 8, 1983 (aged 19) | Colo-Colo | ||
| 6 | DF | Fernando Fica | April 21, 1983 (aged 19) | Colo-Colo | ||
| 7 | MF | Christian Martínez | June 18, 1983 (aged 19) | Universidad de Chile | ||
| 8 | MF | Marco Estrada | May 28, 1983 (aged 19) | Everton | ||
| 9 | FW | Marcos Ávila | February 6, 1983 (aged 19) | Colo-Colo | ||
| 10 | MF | Cristián Muñoz | May 23, 1983 (aged 19) | Universidad de Chile | ||
| 11 | FW | Eduardo Rubio | November 7, 1983 (aged 19) | Universidad Católica | ||
| 12 | GK | Claudio Bravo | April 13, 1983 (aged 19) | Colo-Colo | ||
| 13 | DF | José Manuel Rojas | June 23, 1983 (aged 19) | Universidad de Chile | ||
| 14 | MF | Luis Pedro Figueroa | May 14, 1983 (aged 19) | Universidad de Concepción | ||
| 15 | MF | Albert Acevedo | May 6, 1983 (aged 19) | Universidad Católica | ||
| 16 | FW | Luis Jiménez | June 17, 1984 (aged 18) |  Ternana | ||
| 17 | MF | Luis Jara | January 12, 1983 (aged 19) | Universidad Católica | ||
| 18 | MF | Jorge Valdivia | October 19, 1983 (aged 19) | Colo-Colo | ||
| 19 | FW | Mauricio Pinilla | February 4, 1984 (aged 18) | Universidad de Chile | ||
| 20 | MF | Mark González | July 10, 1984 (aged 18) | Universidad Católica |
(Source for player names: [1] )
Coach: Fabián Burbano 
| No. | Pos. | Player | Date of birth (age) | Caps | Goals | Club |
|---|---|---|---|---|---|---|
| 1 | GK | Julio Eche | August 12, 1983 (aged 19) | Delfín | ||
| 2 | DF | Pedro Esterilla | October 28, 1984 (aged 18) | ESPOLI | ||
| 3 | DF | Luis Checa | December 21, 1983 (aged 19) | El Nacional | ||
| 4 | DF | Jayro Campos | July 18, 1984 (aged 18) |  Gent | ||
| 5 | MF | Leonardo Soledispa | January 15, 1983 (aged 19) | Barcelona | ||
| 6 | DF | Juan Guerrón | October 21, 1983 (aged 19) | ESPOLI | ||
| 7 | FW | Roberto Miña | November 7, 1984 (aged 18) | Huracán | ||
| 8 | MF | Oswaldo Minda | July 26, 1983 (aged 19) | Aucas | ||
| 9 | FW | Félix Borja | April 2, 1983 (aged 19) | El Nacional | ||
| 10 | MF | Luis Saritama | October 20, 1983 (aged 19) | Deportivo Quito | ||
| 11 | FW | Joffre Guerrón | April 28, 1985 (aged 17) | Aucas | ||
| 12 | GK | Carlos Camacho | September 14, 1983 (aged 19) | Deportivo Quevedo | ||
| 13 | DF | Luis Velasco | January 6, 1983 (aged 19) | LDU Quito | ||
| 14 | MF | Luis Bolaños | March 27, 1985 (aged 17) | LDU Quito | ||
| 15 | MF | Tyron Macías | July 9, 1984 (aged 18) | LDU Quito | ||
| 16 | DF | Ángel Anaguano | February 14, 1983 (aged 19) | Deportivo Quito | ||
| 17 | MF | Javier Caicedo | August 29, 1984 (aged 18) | El Nacional | ||
| 18 | MF | José Aguirre | January 5, 1983 (aged 19) | Emelec | ||
| 19 | FW | César Barre | March 13, 1983 (aged 19) | Delfín | ||
| 20 | DF | Iván Suárez | May 15, 1983 (aged 19) | Panamá |
(Source for player names: [2] )
Coach: Aníbal Ruiz 
| No. | Pos. | Player | Date of birth (age) | Caps | Club |
|---|---|---|---|---|---|
| 1 | GK | Antony Silva | 27 February 1984 (aged 18) |  Club Libertad | |
| 2 | DF | Óscar Díaz | 29 January 1984 (aged 18) | 12 de Octubre | |
| 3 | DF | Víctor Hugo Mareco | 26 February 1984 (aged 18) | Brescia | |
| 4 | DF | Enrique Meza | 28 November 1985 (aged 17) | Sol de América | |
| 5 | DF | Ángel Martínez | 9 October 1983 (aged 19) | Olimpia Asunción | |
| 6 | DF | Juan Miguel Díaz | 14 August 1983 (aged 19) | Cerro Porteño | |
| 7 | FW | Erwin Avalos | 27 April 1983 (aged 19) | Cerro Porteño | |
| 8 | MF | Édgar Barreto | 15 July 1984 (aged 18) | Cerro Porteño | |
| 9 | MF | Blas López | 14 March 1984 (aged 18) | Club Libertad | |
| 10 | MF | Julio dos Santos | 7 May 1983 (aged 19) | Cerro Porteño | |
| 11 | DF | Ernesto Cristaldo | 16 March 1984 (aged 18) | Cerro Porteño | |
| 12 | GK | Marco Almeda | 23 March 1984 (aged 18) | Cerro Porteño | |
| 13 | MF | Jorge Cáceres | 16 June 1983 (aged 19) | Colombia | |
| 14 | MF | Cristian Andersen | 3 June 1984 (aged 18) | Sportivo Luqueño | |
| 15 | FW | Dante López | 16 August 1983 (aged 19) | Sol de América | |
| 16 | MF | Andrés Pérez Matto | 7 February 1984 (aged 18) | Olimpia Asunción | |
| 17 | FW | Pedro Javier Velázquez | 13 May 1983 (aged 19) | Club Libertad | |
| 18 | FW | Nelson Romero | 18 November 1984 (aged 18) | San Lorenzo | |
| 19 | FW | Jesús Martínez | 27 September 1983 (aged 19) | Sportivo Trinidense | |
| 20 | DF | Angel Ramos | 1 October 1983 (aged 19) | Club Guaraní |
Coach: Jorge Orosmán da Silva
| No. | Pos. | Player | Date of birth (age) | Caps | Goals | Club |
|---|---|---|---|---|---|---|
| 1 | GK | Martín Silva | March 25, 1983 (aged 19) | Defensor Sporting | ||
| 2 | DF | Nelson Semperena | February 19, 1984 (aged 18) | Defensor Sporting | ||
| 3 | DF | Guillermo Rodríguez | March 21, 1984 (aged 18) | Danubio | ||
| 4 | DF | Marcelo López | January 5, 1983 (aged 19) | River Plate | ||
| 5 | MF | Agustín Viana | August 23, 1983 (aged 19) | Nacional | ||
| 6 | DF | Carlos Valdez | May 2, 1983 (aged 19) | Nacional | ||
| 7 | MF | Jorge Martínez | April 5, 1983 (aged 19) | Montevideo Wanderers | ||
| 8 | MF | Carlos Diogo | July 18, 1983 (aged 19) | River Plate | ||
| 9 | FW | William Ferreira | February 25, 1983 (aged 19) | Nacional | ||
| 10 | MF | Rubén Olivera | May 4, 1983 (aged 19) | Juventus | ||
| 11 | MF | Cristian Rodríguez | September 30, 1985 (aged 17) | Peñarol | ||
| 12 | GK | Sebastián Viera | March 7, 1983 (aged 19) | Nacional | ||
| 13 | MF | Diego Montenegro | June 30, 1983 (aged 19) | Racing Club | ||
| 14 | DF | Álvaro Alonso | March 25, 1984 (aged 18) | Peñarol | ||
| 15 | DF | Ignacio Ithurralde | May 30, 1983 (aged 19) | Defensor Sporting | ||
| 16 | FW | Marcelo Guerrero | January 20, 1983 (aged 19) | Villa Española | ||
| 17 | MF | Carlos Grossmüller | May 4, 1983 (aged 19) | Danubio | ||
| 18 | FW | Richard Porta | August 1, 1983 (aged 19) | River Plate | ||
| 19 | FW | Andrés Rodríguez | January 21, 1983 (aged 19) | Defensor Sporting | ||
| 20 | MF | Eduardo Fernández | April 15, 1983 (aged 19) | Bella Vista |
(Source for player names: [3] )