The 2004–05 UEFA Cup was the 34th edition of the UEFA Cup. The format of the competition had changed from previous seasons, replacing that from the previous one after the abolition of the Cup Winners' Cup in 1999; an extra qualifying round was introduced, as was a group phase after the first round. The group stage operated in a single round-robin format consisting of eight groups of five teams, each team plays two games at home and two away and the top three finishers of each group progress to the knock-out round, joining the eight third-placed teams from the UEFA Champions League group stage. The tournament was won by CSKA Moscow, coming from behind in the final against Sporting CP, in whose home stadium the match was played. It was the first win by a Russian side in any European competition. The match was refereed by Graham Poll. Valencia were the defending champions, but were eliminated by Steaua București in the Round of 32 after dropping out of the UEFA Champions League Group Stage.

Teams

The labels in the parentheses show how each team qualified for the place of its starting round:

Qualifying rounds

First qualifying round

Second qualifying round

First round

Group stage

Based on paragraph 4.06 in the UEFA regulations for the current season, tiebreakers, if necessary, are applied in the following order:

Group A

Group B

Group C

Group D

Group E

Group F

Group G

Group H

Knockout stage

Bracket

Round of 32

Round of 16

Quarter-finals

Semi-finals

Final

Top goalscorers