The 2003 Categoría Primera A season was the 55th season of Colombia's top-flight football league.
The Campeonato Apertura (officially the 2003 Copa Mustang I for sponsorship reasons) was the first tournament of the season. The tournament began on February 2 and ended on June 8.
The second phase of the tournament consisted of two groups of 4 teams. This was played by the best eight teams from the first phase of the tournament. The winners of each group faced each other in the Finals to define the champion.
Standings
Results
Standings
Results
The Campeonato Finalización (officially the 2003 Copa Mustang II for sponsorship reasons) was the second tournament of the season. The tournament began on July 13 and ended on December 21.
Standings
Results
Standings
1: Deportes Tolima advanced to the Finals for having scored more away goals than Junior
Results