Head to Head
| England Development League 2 | 2023/12/18 13:30 | Millwall U21 v Cardiff U21 | W | 5-1 |
| England Development League 2 | 2023/09/26 13:00 | Cardiff U21 v Millwall U21 | W | 0-1 |
| England Development League 2 | 2023/02/21 12:00 | Cardiff U21 v Millwall U21 | L | 4-2 |
| England Development League 2 | 2022/10/31 14:00 | Millwall U21 v Cardiff U21 | W | 5-0 |
Home History
| England Development League 2 | 2024/11/14 12:00 | Millwall U21 v Sheffield Wed U21 | D | 1-1 |
| England Development League 2 | 2024/11/04 13:00 | Brentford U21 v Millwall U21 | L | 3-1 |
| England Development League 2 | 2024/10/29 13:00 | Bournemouth U21 v Millwall U21 | L | 3-1 |
| England Development League 2 | 2024/10/22 13:00 | Millwall U21 v Charlton U21 | W | 2-0 |
| England Development League 2 | 2024/09/27 13:00 | Fleetwood Town U21 v Millwall U21 | L | 2-1 |
| England Development League 2 | 2024/09/24 13:00 | Millwall U21 v Colchester U21 | W | 3-0 |
| England Development League 2 | 2024/09/17 12:00 | Birmingham U21 v Millwall U21 | L | 4-1 |
| England Development League 2 | 2024/09/10 13:00 | Millwall U21 v Peterborough U21 | W | 2-1 |
Away History
| England U21 Premier League Cup | 2024/11/08 19:00 | Everton U21 v Cardiff U21 | D | 2-2 |
| England Development League 2 | 2024/11/04 14:00 | Cardiff U21 v Bristol City U21 | W | 4-1 |
| England Development League 2 | 2024/10/28 19:00 | Swansea U21 v Cardiff U21 | W | 0-1 |
| Wales League Cup | 2024/10/21 19:00 | Cardiff U21 v Cardiff MU | W | 3-2 |
| England U21 Premier League Cup | 2024/10/17 17:00 | Watford U21 v Cardiff U21 | W | 0-2 |
| England Development League 2 | 2024/10/05 13:00 | Cardiff U21 v Charlton U21 | W | 2-0 |
| England Development League 2 | 2024/10/01 11:00 | Cardiff U21 v Ipswich U21 | D | 2-2 |
| England Development League 2 | 2024/09/27 13:00 | Sheff Utd U21 v Cardiff U21 | L | 2-0 |