| Club: | Millwall |
| Season: | 2004–05 |
| Manager: | Dennis Wise (player-manager) |
| Chairman: |  Theo Paphitis |
| Stadium: | The Den |
| League: | Championship |
| League Result: | 10th |
| Cup1: | FA Cup |
| Cup1 Result: | Third round |
| Cup2: | League Cup |
| Cup2 Result: | Third round |
| Cup3: | UEFA Cup |
| Cup3 Result: | First round |
| League Topscorer: | Barry Hayles (12) |
| Season Topscorer: | Barry Hayles (12) |
| Average Attendance: | 11,656 |
| Prevseason: | 2003–04 |
| Nextseason: | 2005–06 |
During the 2004–05 English football season, Millwall competed in the Football League Championship.
In the UEFA Cup, Millwall lost 4–2 on aggregate in the first round proper, to Hungarian Champions Ferencváros, with Wise scoring both Millwall goals. Millwall put up a brave fight in both games, but the Hungarian champions were too strong. Surprisingly, whilst Millwall were seeded, Ferencvaros were not. Millwall could have had an easier draw, against Chechnyan minnows Terek Grozny. If Millwall had beaten them, then they would have made it into the group stage of the competition, where they would have faced some of Europe's elite, including teams such as Lazio and Schalke.
In 2005, Theo Paphitis announced that he was stepping down as chairman of the club with Jeff Burnige to replace him from May 2005. At the end of the 2004–05 season, manager Dennis Wise announced that he was leaving as he was unable to form a working relationship with the new chairman.
See main article: 2004–05 Football League Championship.
Millwall's score comes first
| Win | Draw | Loss |
| Date | Opponent | Venue | Result | Attendance | Scorers | |
|---|---|---|---|---|---|---|
| 7 August 2004 | Plymouth Argyle | A | 0–0 | 16,063 | ||
| 10 August 2004 | Wigan Athletic | H | 0–2 | 10,660 | ||
| 14 August 2004 | Leicester City | H | 2–0 | 11,754 | Morris, Dichio | |
| 21 August 2004 | Coventry City | A | 1–0 | 13,910 | Dichio | |
| 28 August 2004 | Reading | H | 1–0 | 12,098 | Dichio | |
| 12 September 2004 | Ipswich Town | A | 0–2 | 21,246 | ||
| 19 September 2004 | Watford | H | 0–2 | 10,865 | ||
| 22 September 2004 | Derby County | H | 3–1 | 23,422 | Wise, Simpson, Ifill | |
| 25 September 2004 | Rotherham United | A | 1–1 | 5,062 | Ifill | |
| 3 October 2004 | Nottingham Forest | H | 1–0 | 11,233 | Livermore | |
| 16 October 2004 | Sunderland | A | 0–1 | 23,839 | ||
| 19 October 2004 | Gillingham | H | 2–1 | 10,722 | Hayles, Dunne | |
| 23 October 2004 | Cardiff City | H | 2–2 | 10,476 | Tessem, Harris | |
| 30 October 2004 | Stoke City | A | 0–1 | 14,125 | ||
| 2 November 2004 | Queens Park Rangers | A | 1–1 | 16,685 | Hayles | |
| 5 November 2004 | Sunderland | H | 2–0 | 10,513 | Wise (pen), Livermore | |
| 13 November 2004 | Preston North End | A | 1–1 | 22,977 | Hayles | |
| 21 November 2004 | West Ham United | H | 1–0 | 15,025 | Dichio | |
| 27 November 2004 | Burnley | A | 0–1 | 11,471 | ||
| 30 November 2004 | Crewe Alexandra | A | 1–2 | 5,409 | Ifill | |
| 4 December 2004 | Sheffield United | H | 1–2 | 11,207 | Phillips | |
| 7 December 2004 | Wolverhampton Wanderers | A | 2–1 | 24,748 | Dobie, Dichio | |
| 11 December 2004 | Brighton & Hove Albion | H | 2–0 | 12,196 | Dobie, Ifill | |
| 18 December 2004 | Leeds United | A | 1–1 | 26,265 | Morris (pen) | |
| 26 December 2004 | Ipswich Town | H | 3–1 | 14,532 | Hayles, Dichio, Dobie | |
| 28 December 2004 | Derby County | A | 3–0 | 27,725 | Hayles (3) | |
| 1 January 2005 | Watford | A | 0–1 | 13,158 | ||
| 3 January 2005 | Rotherham United | H | 1–2 | 11,725 | Dunne | |
| 15 January 2005 | Nottingham Forest | A | 2–1 | 25,949 | Hayles, Dunne | |
| 22 January 2005 | Wolverhampton Wanderers | H | 1–2 | 13,145 | Wise (pen) | |
| 5 February 2005 | Queens Park Rangers | H | 0–0 | 15,603 | ||
| 12 February 2005 | Gillingham | A | 0–0 | 9,127 | ||
| 19 February 2005 | Stoke City | H | 0–1 | 11,036 | ||
| 22 February 2005 | Cardiff City | A | 1–0 | 11,424 | Dichio (pen) | |
| 26 February 2005 | Brighton & Hove Albion | A | 0–1 | 6,608 | ||
| 6 March 2005 | Leeds United | H | 1–1 | 11,510 | Robinson | |
| 12 March 2005 | Wigan Athletic | A | 0–2 | 18,647 | ||
| 15 March 2005 | Coventry City | H | 1–1 | 8,835 | Morris (pen) | |
| 20 March 2005 | Plymouth Argyle | H | 3–0 | 11,465 | Sweeney, Hayles, Dichio | |
| 2 April 2005 | Leicester City | A | 1–3 | 22,338 | Dichio | |
| 5 April 2005 | Reading | A | 1–2 | 14,379 | Dichio | |
| 9 April 2005 | Crewe Alexandra | H | 4–3 | 10,767 | Hayles, Elliott, Morris, May (pen) | |
| 16 April 2005 | West Ham United | A | 1–1 | 28,221 | Hayles | |
| 24 April 2005 | Preston North End | H | 2–1 | 11,417 | Sweeney, Hayles | |
| 30 April 2005 | Sheffield United | A | 1–0 | 19,797 | Morris | |
| 8 May 2005 | Burnley | H | 0–0 | 12,171 |
See main article: 2004–05 FA Cup.
| R3 | 8 January 2005 | Wolverhampton Wanderers | A | 0–2 | 12,566 |
See main article: 2004–05 Football League Cup.
| R3 | 26 October 2004 | Liverpool | H | 0–3 | 17,655 |
See main article: 2004–05 UEFA Cup.
| R1 First Leg | 16 September 2004 | Ferencváros | H | 1–1 | 11,667 | Wise | |
| R1 Second Leg | 30 September 2004 | Ferencváros | A | 1–3 | 15,229 | Wise |
Squad at end of season[1]