| 1. Ronde | 28.03.2021 | Bray Wanderers | - | Treaty United | 0:0 | ||||
| 2. Ronde | 02.04.2021 | Treaty United | - | Wexford FC | 1:0 | ||||
| 3. Ronde | 09.04.2021 | Treaty United | - | Cobh Ramblers | 1:1 | ||||
| 4. Ronde | 16.04.2021 | Galway United | - | Treaty United | 1:1 | ||||
| 5. Ronde | 23.04.2021 | Treaty United | - | Cork City | 2:1 | ||||
| 6. Ronde | 30.04.2021 | Shelbourne FC | - | Treaty United | 2:2 | ||||
| 8. Ronde | 14.05.2021 | Treaty United | - | Athlone Town | 1:0 | ||||
| 9. Ronde | 21.05.2021 | Cabinteely FC | - | Treaty United | 2:1 | ||||
| 10. Ronde | 28.05.2021 | Treaty United | - | Bray Wanderers | 2:0 | ||||
| 11. Ronde | 11.06.2021 | Wexford FC | - | Treaty United | 1:2 | ||||
| 12. Ronde | 19.06.2021 | Cobh Ramblers | - | Treaty United | 0:2 | ||||
| 14. Ronde | 02.07.2021 | Cork City | - | Treaty United | 2:3 | ||||
| 15. Ronde | 09.07.2021 | Treaty United | - | Shelbourne FC | 1:1 | ||||
| 26. Ronde | 15.10.2021 | Treaty United | - | Athlone Town | 1:1 | ||||
| 25. Ronde | 22.10.2021 | UC Dublin | - | Treaty United | 2:1 | ||||
| 27. Ronde | 29.10.2021 | Cabinteely FC | - | Treaty United | 0:2 |
Ierland