Head to Head
| England Development League 2 | 2025/10/06 12:00 | Watford U21 v Millwall U21 | L | 3-1 |
| England Development League 2 | 2025/03/11 14:00 | Millwall U21 v Watford U21 | W | 4-2 |
| England Development League 2 | 2024/12/02 13:00 | Watford U21 v Millwall U21 | W | 1-3 |
| England Development League 2 | 2024/03/11 14:00 | Millwall U21 v Watford U21 | W | 7-0 |
| England Development League 2 | 2023/12/11 13:00 | Watford U21 v Millwall U21 | W | 1-3 |
| England Development League 2 | 2023/02/14 13:30 | Millwall U21 v Watford U21 | D | 1-1 |
| England Development League 2 | 2022/09/13 12:00 | Watford U21 v Millwall U21 | W | 1-4 |
Home History
| England Development League 2 | 2025/10/06 12:00 | Watford U21 v Millwall U21 | L | 3-1 |
| England Development League 2 | 2025/09/30 13:00 | Cardiff U21 v Millwall U21 | L | 4-0 |
| England U21 Premier League Cup | 2025/09/26 18:00 | Millwall U21 v Wolverhampton U21 | D | 1-1 |
| England Development League 2 | 2025/09/23 12:00 | Millwall U21 v Colchester U21 | W | 4-0 |
| England Development League 2 | 2025/09/16 13:00 | Sheff Utd U21 v Millwall U21 | L | 2-0 |
| England Development League 2 | 2025/09/09 12:30 | Millwall U21 v Huddersfield U21 | W | 2-0 |
| England Development League 2 | 2025/08/26 13:00 | Millwall U21 v Crewe U21 | L | 2-3 |
| England Development League 2 | 2025/08/19 12:00 | Hull U21 v Millwall U21 | L | 1-0 |
Away History
| England U21 Premier League Cup | 2025/10/17 18:00 | Watford U21 v Coventry U21 | W | 4-1 |
| England Development League 2 | 2025/10/10 13:00 | QPR U21 v Watford U21 | D | 1-1 |
| England Development League 2 | 2025/10/06 12:00 | Watford U21 v Millwall U21 | W | 3-1 |
| England Development League 2 | 2025/09/29 12:00 | Bournemouth U21 v Watford U21 | L | 1-0 |
| England Development League 2 | 2025/09/19 13:00 | Watford U21 v Cardiff U21 | L | 0-2 |
| England Development League 2 | 2025/09/16 11:00 | Barnsley U21 v Watford U21 | W | 0-3 |
| England U21 Premier League Cup | 2025/09/09 18:00 | Leyton Orient U21 v Watford U21 | L | 3-2 |
| England Development League 2 | 2025/09/05 13:00 | Watford U21 v Sheff Utd U21 | L | 0-5 |