The 2003–04 UEFA (Union of European Football Associations) 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.

The competition was won by Portugal's Porto, who defeated Monaco of France 3–0 at the Arena AufSchalke in Gelsenkirchen, Germany for Portugal's first win since 1987.

This was Porto's second European trophy in two years, following their UEFA Cup success from the previous season.

This was the first UEFA Champions League competition to feature a 16-team knockout round instead of a second group stage.

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