The 2003–04 UEFA Champions League was the 12th season of UEFA's premier European club football tournament, the UEFA Champions League, since its rebranding from the European Cup in 1992, and the 49th tournament overall. This was the first UEFA Champions League edition to feature a new format with a 16-team knockout round instead of a second group stage. The competition was won by Portugal's Porto, who defeated Monaco of France 3–0 at the Arena AufSchalke in Gelsenkirchen, Germany. This was Portugal's first win since 1987, and Porto's second European trophy in two years, following their UEFA Cup success from the previous season. This was the second consecutive victory in a European cup for Porto coach José Mourinho, who beat Monaco coached by Didier Deschamps, a two-time winner of the competition as a player. As winners of the competition, Porto went on to represent UEFA in the 2004 Intercontinental Cup. Milan were the defending champions, but were eliminated by Deportivo de La Coruña in the quarter-finals.

Qualification

A total of 72 teams from 48 UEFA member associations participated in the 2003–04 UEFA Champions League. Liechtenstein (who does not have their own domestic league) as well as Andorra and San Marino did not participate. Also not admitted was Azerbaijan, which was suspended by UEFA. Each association enters a certain number of clubs to the Champions League based on its league coefficient; associations with a higher league coefficient may enter more clubs than associations with a lower league coefficient, but no association may enter more than four teams.

Association ranking

For the 2003–04 UEFA Champions League, the associations are allocated places according to their 2002 UEFA country coefficients, which takes into account their performance in European competitions from 1997–98 to 2001–02.

Distribution

Since the title holders (Milan) also qualified for the Champions League Third qualifying round through their domestic league, one Third qualifying round spot was vacated. Due to this, as well as due to suspension of Azerbaijan, the following changes to the default access list are made:

Teams

League positions of the previous season shown in parentheses (TH: Champions League title holders).

Round and draw dates

The schedule of the competition is as follows (all draws are held at UEFA headquarters in Nyon, Switzerland, unless stated otherwise).

Qualifying rounds

First qualifying round

Second qualifying round

Third qualifying round

Group stage

Title holders, 16 winners from the third qualifying round, 9 champions from countries ranked 1–10, and six second-placed teams from countries ranked 1–6 were drawn into eight groups of four teams each. The top two teams in each group advanced to the Champions League play-offs, while the third-placed teams advanced to the Third Round of the UEFA Cup. Tiebreakers, if necessary, were applied in the following order: Real Sociedad, Celta Vigo, VfB Stuttgart and Partizan made their debut appearance in the group stage. This season became the first in the history of the Champions League in which three Greek clubs played in the group stage

Group A

Group B

Group C

Group D

Group E

Group F

Group G

Group H

Knockout phase

Bracket

Round of 16

Quarter-finals

Semi-finals

Final

Statistics

Statistics exclude qualifying rounds.

Top goalscorers