The 2003 South American Youth Championship (Sudamericana sub-20) is a football competition contested by all ten U-20 national football teams of CONMEBOL.

Argentina won their fourth trophy.

The three top competitors advance to a single final group of six, wherein each team plays five matches.

The top four teams in the final group qualify to the 2003 FIFA U-20 World Cup.

The following teams entered the tournament: When teams finish level of points, the final order determined according to: