| Professional Development League | - | 2024-05-10 20:00 | Cardiff City U21 | | Hull City U21 | |
| Professional Development League | - | 2024-04-30 21:00 | Coventry City U21 | | Cardiff City U21 | |
| Professional Development League | - | 2024-04-23 20:00 | Cardiff City U21 | 5-1 | Peterborough United U21 | 4-1 |
| Professional Development League | - | 2024-04-19 21:00 | Crewe Alexandra U21 | 1-3 | Cardiff City U21 | 0-0 |
| Professional Development League | - | 2024-04-16 02:00 | Birmingham City U21 | 2-2 | Cardiff City U21 | 2-1 |
| Professional Development League | - | 2024-04-09 20:00 | Cardiff City U21 | 1-1 | Wigan Athletic U21 | 1-1 |
| Professional Development League | - | 2024-03-15 22:00 | Cardiff City U21 | 0-2 | AFC Bournemouth U21 | 0-1 |
| Professional Development League | - | 2024-03-12 03:00 | Swansea City U21 | 2-2 | Cardiff City U21 | 1-1 |
| Professional Development League | - | 2024-03-05 21:00 | Cardiff City U21 | 1-3 | Ipswich Town U21 | 1-0 |
| Professional Development League | - | 2024-02-26 20:00 | Colchester United U21 | 2-0 | Cardiff City U21 | 2-0 |
| Professional Development League | - | 2024-02-20 22:00 | Cardiff City U21 | 2-1 | Charlton Athletic U21 | 1-0 |
| Professional Development League | - | 2024-02-16 22:00 | Cardiff City U21 | 1-1 | Colchester United U21 | 0-1 |
| Professional Development League | - | 2024-02-13 21:00 | Bristol City U21 | 1-2 | Cardiff City U21 | 0-1 |
| Professional Development League | - | 2024-01-30 22:00 | Cardiff City U21 | 0-2 | Queens Park Rangers U21 | 0-0 |
| Professional Development League | - | 2024-01-12 21:00 | AFC Bournemouth U21 | 3-2 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2024-01-08 22:00 | Cardiff City U21 | 0-0 | Watford U21 | 0-0 |
| Professional Development League | - | 2023-12-18 21:30 | Millwall U21 | 5-1 | Cardiff City U21 | 2-1 |
| Professional Development League | - | 2023-12-05 22:00 | Cardiff City U21 | 3-0 | Swansea City U21 | 2-0 |
| Professional Development League | - | 2023-11-27 22:00 | Charlton Athletic U21 | 5-5 | Cardiff City U21 | 2-3 |
| Professional Development League | - | 2023-11-07 22:00 | Cardiff City U21 | 3-0 | Bristol City U21 | 2-0 |
| Professional Development League | - | 2023-10-30 21:00 | Queens Park Rangers U21 | 3-2 | Cardiff City U21 | 2-1 |
| Professional Development League | - | 2023-10-24 20:00 | Watford U21 | 2-2 | Cardiff City U21 | 0-2 |
| Professional Development League | - | 2023-10-03 20:00 | Ipswich Town U21 | 5-2 | Cardiff City U21 | 2-0 |
| Professional Development League | - | 2023-09-26 21:00 | Cardiff City U21 | 0-1 | Millwall U21 | 0-1 |
| Professional Development League | - | 2023-09-12 20:00 | Sheffield United U21 | 6-2 | Cardiff City U21 | 3-1 |
| Professional Development League | - | 2023-09-01 21:00 | Cardiff City U21 | 2-1 | Barnsley U21 | 0-0 |
| Professional Development League | - | 2023-08-26 18:00 | Burnley U21 | 2-2 | Cardiff City U21 | 1-1 |
| Professional Development League | - | 2023-08-22 19:00 | Cardiff City U21 | 3-3 | Sheffield Wednesday U21 | 2-2 |
| Professional Development League | - | 2023-08-15 20:00 | Fleetwood Town U21 | 4-1 | Cardiff City U21 | 3-0 |
| Professional Development League | - | 2023-05-09 20:00 | Cardiff City U21 | 4-2 | Crewe Alexandra U21 | 2-2 |
| Professional Development League | - | 2023-04-30 01:00 | Hull City U21 | 2-0 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2023-04-25 21:00 | Cardiff City U21 | 3-1 | Barnsley U21 | 1-1 |
| Professional Development League | - | 2023-04-17 21:00 | Coventry City U21 | 3-0 | Cardiff City U21 | 2-0 |
| Professional Development League | - | 2023-04-04 19:00 | Cardiff City U21 | 1-1 | Sheffield Wednesday U21 | 1-1 |
| Professional Development League | - | 2023-03-17 19:00 | Cardiff City U21 | 4-2 | Ipswich Town U21 | 2-0 |
| Professional Development League | - | 2023-03-14 20:30 | Ipswich Town U21 | 4-1 | Cardiff City U21 | 3-0 |
| Professional Development League | - | 2023-03-06 22:00 | Reading U21 | 1-1 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2023-02-28 22:00 | Cardiff City U21 | 0-2 | Charlton Athletic U21 | 0-0 |
| Professional Development League | - | 2023-02-21 20:00 | Cardiff City U21 | 4-2 | Millwall U21 | 1-1 |
| Professional Development League | - | 2023-02-14 02:00 | Swansea City U21 | 2-2 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2023-02-03 20:00 | Colchester United U21 | 3-0 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2023-02-01 03:00 | Queens Park Rangers U21 | 3-1 | Cardiff City U21 | 2-1 |
| Professional Development League | - | 2023-01-24 21:00 | Cardiff City U21 | 0-3 | Watford U21 | 0-0 |
| 英超杯 | - | 2023-01-20 22:00 | 狼队U21 | 1-0 | Cardiff City U21 | 0-0 |
| Professional Development League | - | 2023-01-10 21:00 | Cardiff City U21 | 1-0 | Bristol City U21 | 0-0 |
| 英超杯 | - | 2022-12-21 19:00 | Cardiff City U21 | 2-0 | Sunderland U21 | 1-0 |
| 英超杯 | - | 2022-12-03 22:00 | Cardiff City U21 | 0-1 | 狼队U21 | 0-1 |
| 英超杯 | - | 2022-11-25 22:00 | Cardiff City U21 | 1-0 | Reading U21 | 0-0 |
| 英超杯 | - | 2022-11-22 03:00 | Sunderland U21 | 0-2 | Cardiff City U21 | 0-1 |
| Professional Development League | - | 2022-11-14 22:00 | Birmingham City U21 | 0-2 | Cardiff City U21 | 0-1 |
| Professional Development League | - | 2022-11-10 21:00 | Charlton Athletic U21 | 2-1 | Cardiff City U21 | 1-1 |
| Professional Development League | - | 2022-10-31 22:00 | Millwall U21 | 5-0 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2022-10-25 21:00 | Cardiff City U21 | 4-1 | Colchester United U21 | 3-0 |
| Professional Development League | - | 2022-10-18 20:00 | Watford U21 | 0-1 | Cardiff City U21 | 0-0 |
| Professional Development League | - | 2022-10-11 20:00 | Cardiff City U21 | 4-3 | Swansea City U21 | 2-2 |
| Professional Development League | - | 2022-10-03 20:00 | Cardiff City U21 | 2-1 | Reading U21 | 1-0 |
| Professional Development League | - | 2022-09-17 02:00 | Cardiff City U21 | 3-5 | Queens Park Rangers U21 | 1-3 |
| Professional Development League | - | 2022-09-13 20:00 | Bristol City U21 | 5-0 | Cardiff City U21 | 4-0 |
| Professional Development League | - | 2022-09-05 19:00 | Wigan Athletic U21 | 1-2 | Cardiff City U21 | 1-1 |
| Professional Development League | - | 2022-08-30 20:00 | Cardiff City U21 | 1-2 | Burnley U21 | 1-0 |
| 英超杯 | - | 2022-08-26 21:00 | Reading U21 | 1-0 | Cardiff City U21 | 1-0 |
| Professional Development League | - | 2022-08-23 19:00 | Sheffield United U21 | 0-3 | Cardiff City U21 | 0-1 |
| Professional Development League | - | 2022-08-16 19:00 | Cardiff City U21 | 2-1 | Peterborough United U21 | 2-0 |
