| 1 | Sat 5 Sep 2020 | 221-1 v MorecambeGrimsby Town 1-1 Morecambe | Carabao Cup First Round North |
| 2 | Sat 19 Sep 2020 | 220-4 v Salford CityGrimsby Town 0-4 Salford City | Sky Bet League Two |
| 3 | Sat 21 Nov 2020 | 220-5 v Tranmere RoversTranmere Rovers 5-0 Grimsby Town | Sky Bet League Two |
| 4 | Tue 24 Nov 2020 | 22 2-1 v Crawley TownCrawley Town 1-2 Grimsby Town | Sky Bet League Two |
| 5 | Tue 1 Dec 2020 | 221-4 v Exeter CityGrimsby Town 1-4 Exeter City | Sky Bet League Two |
| 6 | Sat 5 Dec 2020 | 221-2 v Colchester UnitedColchester United 2-1 Grimsby Town | Sky Bet League Two |
| 7 | Tue 8 Dec 2020 | 220-2 v Newport CountyGrimsby Town 0-2 Newport County | Sky Bet League Two |
| 8 | Sat 12 Dec 2020 | 221-1 v Mansfield TownGrimsby Town 1-1 Mansfield Town | Sky Bet League Two |
| 9 | Tue 15 Dec 2020 | 22 1-3 v Southend UnitedSouthend United 3-1 Grimsby Town | Sky Bet League Two |
| 10 | Sat 19 Dec 2020 | 221-0 v Scunthorpe UnitedGrimsby Town 1-0 Scunthorpe United | Sky Bet League Two |
| 11 | Tue 22 Dec 2020 | 221-2 v Bradford CityGrimsby Town 1-2 Bradford City | Sky Bet League Two |
| 12 | Sat 26 Dec 2020 | 221-3 v MorecambeMorecambe 3-1 Grimsby Town | Sky Bet League Two |
| 13 | Tue 29 Dec 2020 | 22 0-0 v Oldham AthleticGrimsby Town 0-0 Oldham Athletic | Sky Bet League Two |
| 14 | Sat 2 Jan 2021 | 221-2 v Cambridge UnitedGrimsby Town 1-2 Cambridge United | Sky Bet League Two |
| 15 | Sat 9 Jan 2021 | 220-3 v Port ValePort Vale 3-0 Grimsby Town | Sky Bet League Two |
| 16 | Sat 16 Jan 2021 | 220-0 v Southend UnitedGrimsby Town 0-0 Southend United | Sky Bet League Two |
| 17 | Sat 23 Jan 2021 | 220-3 v Scunthorpe UnitedScunthorpe United 3-0 Grimsby Town | Sky Bet League Two |
| 18 | Sat 6 Feb 2021 | 220-1 v Newport CountyNewport County 1-0 Grimsby Town | Sky Bet League Two |
| 19 | Tue 23 Feb 2021 | 22 2-1 v Crawley TownGrimsby Town 2-1 Crawley Town | Sky Bet League Two |
| 20 | Sat 27 Feb 2021 | 220-1 v Harrogate TownHarrogate Town 1-0 Grimsby Town | Sky Bet League Two |
| 21 | Tue 2 Mar 2021 | 220-1 v Leyton OrientGrimsby Town 0-1 Leyton Orient | Sky Bet League Two |
| 22 | Sat 6 Mar 2021 | 221-2 v Forest Green RoversGrimsby Town 1-2 Forest Green Rovers | Sky Bet League Two |
| 23 | Tue 9 Mar 2021 | 221-1 v Carlisle UnitedCarlisle United 1-1 Grimsby Town | Sky Bet League Two |
| 24 | Sat 13 Mar 2021 | 220-0 v Colchester UnitedGrimsby Town 0-0 Colchester United | Sky Bet League Two |
| 25 | Wed 17 Mar 2021 | 220-0 v Tranmere RoversGrimsby Town 0-0 Tranmere Rovers | Sky Bet League Two |
| 26 | Sat 20 Mar 2021 | 222-2 v Mansfield TownMansfield Town 2-2 Grimsby Town | Sky Bet League Two |
| 27 | Tue 23 Mar 2021 | 221-0 v BarrowBarrow 0-1 Grimsby Town | Sky Bet League Two |
| 28 | Sat 27 Mar 2021 | 221-1 v WalsallGrimsby Town 1-1 Walsall | Sky Bet League Two |
| 29 | Fri 2 Apr 2021 | 221-1 v Salford CitySalford City 1-1 Grimsby Town | Sky Bet League Two |
| 30 | Mon 5 Apr 2021 | 221-1 v Cheltenham TownGrimsby Town 1-1 Cheltenham Town | Sky Bet League Two |
| 31 | Sat 10 Apr 2021 | 220-1 v Bradford CityBradford City 1-0 Grimsby Town | Sky Bet League Two |
| 32 | Sat 17 Apr 2021 | 222-1 v Bolton WanderersGrimsby Town 2-1 Bolton Wanderers | Sky Bet League Two |
| 33 | Tue 20 Apr 2021 | 220-3 v MorecambeGrimsby Town 0-3 Morecambe | Sky Bet League Two |
| 34 | Sat 24 Apr 2021 | 222-1 v Oldham AthleticOldham Athletic 1-2 Grimsby Town | Sky Bet League Two |
| 35 | Tue 27 Apr 2021 | 222-3 v Exeter CityExeter City 3-2 Grimsby Town | Sky Bet League Two |
| 36 | Sat 1 May 2021 | 221-0 v Port ValeGrimsby Town 1-0 Port Vale | Sky Bet League Two |
| 37 | Sat 8 May 2021 | 220-3 v Cambridge UnitedCambridge United 3-0 Grimsby Town | Sky Bet League Two |
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