The 2004–05 UEFA Champions League group stage matches took take place between 14 September and 8 December 2004.
[1] Pot 1 comprised the previous year's title holders Porto and the top seven clubs in the team ranking.
[2][3] Clubs from the same association were paired up to split the matchdays between Tuesday and Wednesday.
The top two teams with the most points or who meet the tie-breaking criteria progress to the first knockout round.
Based on paragraph 4.05 in the UEFA regulations for the current season, if two or more teams are equal on points on completion of the group matches, the following criteria are applied to determine the rankings: Times are CET/CEST,[note 1] as listed by UEFA (local times, if different, are in parentheses).