| 2024-04-27 15:00 | D45 | Millwall |  | - |  | Plymouth Argyle | | h2h |
| 2024-04-17 19:00 | F | Millwall | | 3-1(a.e.t.) |  | Swansea City | | |
| 2024-04-13 15:00 | D43 | Millwall | | 3-1 |  | Cardiff City | Michael Obafemi 9', Jake Cooper 45', Duncan Watmore 90'; Yakou Meité 24' | |
| 2024-04-09 19:45 | D42 | Millwall | | 1-0 |  | Leicester City | Ryan Longman 59' | |
| 2024-03-29 13:00 | D39 | Millwall | | 1-1 |  | West Bromwich | Duncan Watmore 21'; John Swift 67' (pen.) | |
| 2024-03-09 15:00 | D37 | Millwall | | 1-0 |  | Birmingham City | Japhet Tanganga 90' | |
| 2024-03-02 15:00 | D35 | Millwall | | 1-0 |  | Watford | Zian Flemming 3' | |
| 2024-02-21 19:00 | QF | Millwall | | 1-1(4-2 pens) |  | Chelsea | Jack Howland 71'; Harrison Murray-Campbell 66' | |
| 2024-02-17 15:00 | D33 | Millwall | | 0-2 |  | Sheffield Wed. | Iké Ugbo 31', Anthony Musaba 41' | |
| 2024-02-14 20:00 | D32 | Millwall | | 0-4 |  | Ipswich Town | Wes Harding 32' (o.g.); Nathan Broadhead 24', Kieffer Moore 45', Ali Al-Hamadi 90' (pen.) | |
| 2024-01-27 15:00 | D29 | Millwall | | 1-1 |  | Preston North End | Zian Flemming 5'; Brad Potts 33' | |
| 2024-01-13 15:00 | D27 | Millwall | | 1-3 |  | Middlesbrough | Joe Bryan 10'; Lukas Engel 38', Isaiah Jones 58', Marcus Forss 90' | |
| 2024-01-06 12:30 | 3R | Millwall | | 2-3 | | Leicester City | Duncan Watmore 56', Zian Flemming 86'; Cesare Casadei 16', Ricardo Pereira 39', Tom Cannon 61' | |
| 2023-12-29 19:45 | D25 | Millwall | | 1-0 |  | Norwich City | Tom Bradshaw 18' | |
| 2023-12-26 13:00 | D24 | Millwall | | 2-0 |  | QPR | Tom Bradshaw 45', Murray Wallace 90' | |
| 2023-12-16 15:00 | D22 | Millwall | | 1-1 |  | Huddersfield Town | Brooke Norton-Cuffy 57'; Delano Burgzorg 90' (pen.) | |
| 2023-12-02 15:00 | D19 | Millwall | | 1-1 |  | Sunderland | Kevin Nisbet 44'; Jack Clarke 78' (pen.) | |
| 2023-11-25 15:00 | D17 | Millwall | | 0-3 |  | Coventry City | Matt Godden 30', Tatsuhiro Sakamoto 67', Ben Sheaf 88' | |
| 2023-11-04 15:00 | D15 | Millwall | | 0-1 |  | Southampton | Ryan Fraser 90' | |
| 2023-10-24 19:45 | D13 | Millwall | | 1-2 |  | Blackburn Rovers | Wes Harding 3'; Joe Rankin-Costello 22', Callum Brittain 51' | |
| 2023-10-07 15:00 | D11 | Millwall | | 2-2 |  | Hull City | Duncan Watmore 8', Joe Bryan 54'; Jaden Philogene 25', Adama Traoré 30' | |
| 2023-09-30 15:00 | D9 | Millwall | | 0-3 | | Swansea City | Jamal Lowe 23' (pen.), Matt Grimes 57', Mykola Kukharevych 79' | |
| 2023-09-20 19:45 | D7 | Millwall | | 3-0 |  | Rotherham | Ryan Longman 27', Zian Flemming 58', Tom Bradshaw 90' | |
| 2023-09-17 12:00 | D6 | Millwall | | 0-3 |  | Leeds United | Joël Piroe 15' 77', Georginio Rutter 81' | |
| 2023-08-26 15:00 | D4 | Millwall | | 1-0 |  | Stoke City | Kevin Nisbet 38' | |
| 2023-08-12 15:00 | D2 | Millwall | | 0-1 |  | Bristol City | Matty James 90' | |
| 2023-08-08 19:45 | 1R | Millwall | | 0-4 |  | Reading | Kelvin Ehibhatiomhan 1' 51', Charlie Savage 67', Mamadi Camará 88' | |
25/04 - 20:00
26/04 - 20:00
