| 23. Journée | 09.01.2021 | Port Vale FC | - | Grimsby Town | 3:0 | ||||
| 24. Journée | 16.01.2021 | Grimsby Town | - | Southend United | 0:0 |  |
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| 25. Journée | 23.01.2021 | Scunthorpe United | - | Grimsby Town | 3:0 | ||||
| 27. Journée | 30.01.2021 | Grimsby Town | - | Stevenage FC | 1:2 | ||||
| 34. Journée | 06.03.2021 | Grimsby Town | - | Forest Green Rovers | 1:2 | ||||
| 35. Journée | 09.03.2021 | Carlisle United | - | Grimsby Town | 1:1 | ||||
| 39. Journée | 02.04.2021 | Salford City | - | Grimsby Town | 1:1 | ||||
| 40. Journée | 05.04.2021 | Grimsby Town | - | Cheltenham Town | 1:1 | ||||
| 41. Journée | 10.04.2021 | Bradford City | - | Grimsby Town | 1:0 | |
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| 42. Journée | 17.04.2021 | Grimsby Town | - | Bolton Wanderers | 2:1 | ||||
| 43. Journée | 20.04.2021 | Grimsby Town | - | Morecambe FC | 0:3 | ||||
| 30. Journée | 27.04.2021 | Exeter City | - | Grimsby Town | 3:2 | ||||
| 45. Journée | 01.05.2021 | Grimsby Town | - | Port Vale FC | 1:0 |
Angleterre