| Professional Development League | - | 2024-05-11 02:00 | Colchester United U21 | | Sheffield United U21 | |
| Professional Development League | - | 2024-05-04 02:00 | Colchester United U21 | 4-2 | Charlton Athletic U21 | 3-0 |
| Professional Development League | - | 2024-05-01 00:00 | Fleetwood Town U21 | 0-3 | Colchester United U21 | 0-2 |
| Professional Development League | - | 2024-04-20 02:00 | Colchester United U21 | 0-3 | Sheffield Wednesday U21 | 0-2 |
| Professional Development League | - | 2024-04-16 21:00 | Coventry City U21 | 1-2 | Colchester United U21 | 1-1 |
| Professional Development League | - | 2024-04-08 21:00 | Colchester United U21 | 1-1 | Birmingham City U21 | 1-1 |
| Professional Development League | - | 2024-03-27 03:00 | Hull City U21 | 4-1 | Colchester United U21 | 1-0 |
| Professional Development League | - | 2024-03-22 21:00 | Charlton Athletic U21 | 1-2 | Colchester United U21 | 0-1 |
| Professional Development League | - | 2024-03-15 22:00 | Colchester United U21 | 2-3 | Millwall U21 | 0-1 |
| Professional Development League | - | 2024-03-09 03:00 | Colchester United U21 | 6-2 | Bristol City U21 | 3-1 |
| Professional Development League | - | 2024-03-05 22:00 | AFC Bournemouth U21 | 5-0 | Colchester United U21 | 2-0 |
| Professional Development League | - | 2024-03-02 03:00 | Colchester United U21 | | Watford U21 | |
| Professional Development League | - | 2024-02-26 20:00 | Colchester United U21 | 2-0 | Cardiff City U21 | 2-0 |
| Professional Development League | - | 2024-02-22 22:00 | Queens Park Rangers U21 | 1-1 | Colchester United U21 | 0-1 |
| Professional Development League | - | 2024-02-16 22:00 | Cardiff City U21 | 1-1 | Colchester United U21 | 0-1 |
| Professional Development League | - | 2024-02-12 21:30 | Millwall U21 | 2-2 | Colchester United U21 | 1-0 |
| 英超杯 | - | 2024-02-03 03:00 | Luton Town U21 | 0-2 | Colchester United U21 | 0-2 |
| Professional Development League | - | 2024-01-27 03:00 | Colchester United U21 | 2-3 | Ipswich Town U21 | 0-2 |
| 英超杯 | - | 2024-01-23 03:00 | 切尔西U21 | 4-1 | Colchester United U21 | 3-0 |
| Professional Development League | - | 2024-01-12 20:00 | Colchester United U21 | 1-2 | Swansea City U21 | 1-1 |
| 英超杯 | - | 2023-12-12 03:00 | Colchester United U21 | 1-2 | 列斯联U21 | 1-0 |
| Professional Development League | - | 2023-12-05 21:00 | Bristol City U21 | 4-2 | Colchester United U21 | 1-1 |
| Professional Development League | - | 2023-12-01 22:00 | Swansea City U21 | 4-1 | Colchester United U21 | 3-0 |
| Professional Development League | - | 2023-11-27 22:00 | Colchester United U21 | 3-6 | Queens Park Rangers U21 | 2-3 |
| 英超杯 | - | 2023-11-09 03:00 | Colchester United U21 | 2-0 | Luton Town U21 | 1-0 |
| Professional Development League | - | 2023-11-01 03:00 | Ipswich Town U21 | 2-0 | Colchester United U21 | 2-0 |
| 英超杯 | - | 2023-10-07 02:00 | Colchester United U21 | 2-5 | 切尔西U21 | 0-2 |
| Professional Development League | - | 2023-09-29 19:00 | Colchester United U21 | 0-1 | AFC Bournemouth U21 | 0-0 |
| Professional Development League | - | 2023-09-26 20:00 | Watford U21 | 2-1 | Colchester United U21 | 2-0 |
| 英超杯 | - | 2023-09-16 02:00 | 列斯联U21 | 3-2 | Colchester United U21 | 2-2 |
| Professional Development League | - | 2023-09-12 21:00 | Wigan Athletic U21 | 3-0 | Colchester United U21 | 2-0 |
| Professional Development League | - | 2023-09-02 02:00 | Colchester United U21 | 1-4 | Burnley U21 | 1-1 |
| Professional Development League | - | 2023-08-28 20:00 | Crewe Alexandra U21 | 4-0 | Colchester United U21 | 2-0 |
| Professional Development League | - | 2023-08-21 21:00 | Colchester United U21 | 3-2 | Barnsley U21 | 2-0 |
| Professional Development League | - | 2023-08-15 21:00 | Peterborough United U21 | 0-3 | Colchester United U21 | 0-0 |
| Professional Development League | - | 2023-05-10 02:00 | Colchester United U21 | 1-1 | Peterborough United U21 | 0-0 |
| Professional Development League | - | 2023-05-02 21:00 | Sheffield United U21 | 7-1 | Colchester United U21 | 3-1 |
| Professional Development League | - | 2023-04-27 21:00 | Reading U21 | 1-1 | Colchester United U21 | 0-0 |
| Professional Development League | - | 2023-04-25 02:00 | Colchester United U21 | 1-2 | Burnley U21 | 0-1 |
| Professional Development League | - | 2023-04-14 21:00 | Hull City U21 | 2-3 | Colchester United U21 | 1-1 |
| Professional Development League | - | 2023-04-05 02:00 | Colchester United U21 | 1-1 | Barnsley U21 | 0-0 |
| Professional Development League | - | 2023-03-28 21:00 | Coventry City U21 | 3-1 | Colchester United U21 | 1-0 |
| Professional Development League | - | 2023-03-24 19:30 | Colchester United U21 | 1-2 | Watford U21 | 0-2 |
| Professional Development League | - | 2023-03-21 22:00 | Colchester United U21 | 1-2 | Millwall U21 | 1-1 |
| Professional Development League | - | 2023-03-14 03:00 | Colchester United U21 | 1-1 | Crewe Alexandra U21 | 1-0 |
| Professional Development League | - | 2023-03-03 21:00 | Colchester United U21 | 2-3 | Queens Park Rangers U21 | 0-3 |
| Professional Development League | - | 2023-02-28 21:00 | Colchester United U21 | 3-4 | Swansea City U21 | 2-2 |
| Professional Development League | - | 2023-02-21 21:00 | Bristol City U21 | 1-2 | Colchester United U21 | 1-0 |
| Professional Development League | - | 2023-02-14 21:00 | Colchester United U21 | 2-2 | Charlton Athletic U21 | 1-1 |
| Professional Development League | - | 2023-02-03 20:00 | Colchester United U21 | 3-0 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2023-01-27 21:00 | Ipswich Town U21 | 4-2 | Colchester United U21 | 1-1 |
| 英超杯 | - | 2023-01-20 22:00 | Birmingham City U21 | 3-2 | Colchester United U21 | 2-1 |
| 英超杯 | - | 2022-12-20 21:00 | Colchester United U21 | 1-1 | 埃弗顿U21 | 0-1 |
| 英超杯 | - | 2022-12-07 03:00 | 埃弗顿U21 | 7-2 | Colchester United U21 | 4-0 |
| 英超杯 | - | 2022-12-03 03:00 | 南安普敦U21 | 7-1 | Colchester United U21 | 4-1 |
| 英超杯 | - | 2022-11-26 21:00 | Colchester United U21 | 0-5 | 南安普敦U21 | 0-0 |
| Professional Development League | - | 2022-11-08 21:15 | Millwall U21 | 4-1 | Colchester United U21 | 2-1 |
| Professional Development League | - | 2022-11-01 21:30 | Watford U21 | 0-6 | Colchester United U21 | 0-4 |
| Professional Development League | - | 2022-10-25 21:00 | Cardiff City U21 | 4-1 | Colchester United U21 | 3-0 |
| Professional Development League | - | 2022-10-19 02:00 | Colchester United U21 | 2-2 | Reading U21 | 2-0 |
| 英超杯 | - | 2022-10-15 02:00 | Colchester United U21 | 2-1 | Birmingham City U21 | 0-1 |
| Professional Development League | - | 2022-10-11 20:00 | Colchester United U21 | 0-1 | Bristol City U21 | 0-0 |
| Professional Development League | - | 2022-10-03 22:00 | Swansea City U21 | 4-1 | Colchester United U21 | 1-1 |
| Professional Development League | - | 2022-09-23 20:00 | Queens Park Rangers U21 | 2-0 | Colchester United U21 | 0-0 |
| Professional Development League | - | 2022-09-16 21:30 | Colchester United U21 | 2-1 | Ipswich Town U21 | 0-1 |
| Professional Development League | - | 2022-09-12 21:00 | Charlton Athletic U21 | 2-2 | Colchester United U21 | 0-0 |
| Professional Development League | - | 2022-09-06 02:00 | Birmingham City U21 | 5-0 | Colchester United U21 | 2-0 |
| Professional Development League | - | 2022-08-24 21:00 | Wigan Athletic U21 | 1-2 | Colchester United U21 | 0-2 |
| Professional Development League | - | 2022-08-16 18:00 | Colchester United U21 | 3-1 | Sheffield Wednesday U21 | 2-1 |
