Key: Win : Draw : Loss
| Date | Home | Away | Ref | ||
|---|---|---|---|---|---|
| 04/08/2018 | Millwall | 2 | 2 | Middlesbrough | K Friend |
| 11/08/2018 | Blackburn | 0 | 0 | Millwall | G Ward |
| 18/08/2018 | Millwall | 2 | 1 | Derby | S Martin |
| 22/08/2018 | Sheffield Weds | 2 | 1 | Millwall | A Madley |
| 26/08/2018 | Rotherham | 1 | 0 | Millwall | G Eltringham |
| 01/09/2018 | Millwall | 1 | 2 | Swansea | G Scott |
| 15/09/2018 | Millwall | 1 | 1 | Leeds | C Kavanagh |
| 19/09/2018 | QPR | 2 | 0 | Millwall | R Jones |
| 22/09/2018 | West Brom | 2 | 0 | Millwall | T Robinson |
| 29/09/2018 | Millwall | 2 | 3 | Sheffield United | A Davies |
| 03/10/2018 | Nott'm Forest | 2 | 2 | Millwall | J Moss |
| 06/10/2018 | Millwall | 2 | 1 | Aston Villa | T Harrington |
| 20/10/2018 | Reading | 3 | 1 | Millwall | D Webb |
| 23/10/2018 | Millwall | 2 | 1 | Wigan | J Linington |
| 27/10/2018 | Millwall | 3 | 0 | Ipswich | R Jones |
| 03/11/2018 | Brentford | 2 | 0 | Millwall | S Hooper |
| 10/11/2018 | Norwich | 4 | 3 | Millwall | J Simpson |
| 24/11/2018 | Millwall | 1 | 1 | Bolton | L Swabey |
| 28/11/2018 | Millwall | 0 | 2 | Birmingham | S Duncan |
| 02/12/2018 | Bristol City | 1 | 1 | Millwall | D England |
| 08/12/2018 | Millwall | 2 | 2 | Hull | K Stroud |
| 15/12/2018 | Preston | 3 | 2 | Millwall | J Duncan |
| 22/12/2018 | Stoke | 1 | 0 | Millwall | C Kavanagh |
| 26/12/2018 | Millwall | 1 | 0 | Reading | A Davies |
| 29/12/2018 | Millwall | 1 | 0 | Nott'm Forest | T Harrington |
| 01/01/2019 | Ipswich | 2 | 3 | Millwall | S Martin |
| 12/01/2019 | Millwall | 0 | 2 | Blackburn | R Jones |
| 19/01/2019 | Middlesbrough | 1 | 1 | Millwall | K Stroud |
| 02/02/2019 | Millwall | 0 | 0 | Rotherham | A Madley |
| 09/02/2019 | Swansea | 1 | 0 | Millwall | K Friend |
| 12/02/2019 | Millwall | 0 | 0 | Sheffield Weds | T Robinson |
| 20/02/2019 | Derby | 0 | 1 | Millwall | J Linington |
| 23/02/2019 | Millwall | 1 | 3 | Preston | S Martin |
| 26/02/2019 | Hull | 2 | 1 | Millwall | D Bond |
| 02/03/2019 | Millwall | 1 | 3 | Norwich | D Webb |
| 09/03/2019 | Bolton | 2 | 1 | Millwall | S Hooper |
| 13/03/2019 | Birmingham | 0 | 2 | Millwall | J Brooks |
| 30/03/2019 | Leeds | 3 | 2 | Millwall | D Bond |
| 06/04/2019 | Millwall | 2 | 0 | West Brom | J Linington |
| 10/04/2019 | Millwall | 0 | 0 | QPR | J Brooks |
| 13/04/2019 | Sheffield United | 1 | 1 | Millwall | D Webb |
| 19/04/2019 | Millwall | 1 | 1 | Brentford | J Simpson |
| 22/04/2019 | Aston Villa | 1 | 0 | Millwall | T Robinson |
| 27/04/2019 | Millwall | 0 | 0 | Stoke | O Langford |
| 30/04/2019 | Millwall | 1 | 2 | Bristol City | A Madley |
| 05/05/2019 | Wigan | 1 | 0 | Millwall | A Woolmer |