| 1 | Wed 21 Jul 2021 | 80-4 v Queens Park RangersHarrow Borough 0-4 Queens Park Rangers | Friendly |
| 2 | Tue 17 Aug 2021 | 73-0 v Hartley WintneyHartley Wintney 0-3 Harrow Borough | Southern League - Premier South |
| 3 | Sat 21 Aug 2021 | 71-2 v SalisburySalisbury 2-1 Harrow Borough | Southern League - Premier South |
| 4 | Mon 30 Aug 2021 | 110-1 v HendonHendon 1-0 Harrow Borough | Southern League - Premier South |
| 5 | Sat 4 Sep 2021 | 84-2 v RamsgateHarrow Borough 4-2 Ramsgate | Emirates FA Cup First Qualifying Round |
| 6 | Tue 7 Sep 2021 | 74-3 v HendonHendon 3-4 Harrow Borough | CSS League Challenge Cup Preliminary Round |
| 7 | Sat 18 Sep 2021 | 82-0 v Welling UnitedWelling United 0-2 Harrow Borough | Emirates FA Cup Second Qualifying Round |
| 8 | Sat 25 Sep 2021 | 112-0 v Dorchester TownHarrow Borough 2-0 Dorchester Town | Southern League - Premier South |
| 9 | Sat 2 Oct 2021 | 102-1 v MarlowHarrow Borough 2-1 Marlow | Emirates FA Cup Third Qualifying Round |
| 10 | Sat 9 Oct 2021 | 101-2 v Truro CityTruro City 2-1 Harrow Borough | Southern League - Premier South |
| 11 | Tue 12 Oct 2021 | 10 3-1 v Beaconsfield TownHarrow Borough 3-1 Beaconsfield Town | Southern League - Premier South |
| 12 | Sat 16 Oct 2021 | 114-2 v Chelmsford CityHarrow Borough 4-2 Chelmsford City | Emirates FA Cup Fourth Qualifying Round |
| 13 | Tue 19 Oct 2021 | 112-0 v Kings LangleyKings Langley 0-2 Harrow Borough | Southern League - Premier South |
| 14 | Sat 23 Oct 2021 | 102-0 v Wimborne TownHarrow Borough 2-0 Wimborne Town | Southern League - Premier South |
| 15 | Tue 26 Oct 2021 | 111-0 v Gosport BoroughHarrow Borough 1-0 Gosport Borough | Southern League - Premier South |
| 16 | Sat 6 Nov 2021 | 110-1 v PortsmouthPortsmouth 1-0 Harrow Borough | Emirates FA Cup First Round |
| 17 | Sat 13 Nov 2021 | 10 0-3 v LeistonLeiston 3-0 Harrow Borough | Buildbase FA Trophy First Round |
| 18 | Tue 16 Nov 2021 | 101-4 v Metropolitan PoliceHarrow Borough 1-4 Metropolitan Police | Southern League - Premier South |
| 19 | Sat 20 Nov 2021 | 82-1 v Merthyr TownMerthyr Town 1-2 Harrow Borough | Southern League - Premier South |
| 20 | Tue 23 Nov 2021 | 84-2 v Swindon SupermarineSwindon Supermarine 2-4 Harrow Borough | Southern League - Premier South |
| 21 | Wed 1 Dec 2021 | 101-2 v FarnboroughHarrow Borough 1-2 Farnborough | Southern League - Premier South |
| 22 | Sat 4 Dec 2021 | 10 1-3 v Dorchester TownDorchester Town 3-1 Harrow Borough | Southern League - Premier South |
| 23 | Tue 7 Dec 2021 | 160-0 v Chesham UnitedChesham United 0-0 Harrow Borough | Southern League - Premier South |
| 24 | Sat 11 Dec 2021 | 160-4 v Chesham UnitedHarrow Borough 0-4 Chesham United | Southern League - Premier South |
| 25 | Tue 14 Dec 2021 | 153-2 v Tiverton TownHarrow Borough 3-2 Tiverton Town | Southern League - Premier South |
| 26 | Tue 21 Dec 2021 | 71-7 v Taunton TownTaunton Town 7-1 Harrow Borough | Southern League - Premier South |
| 27 | Tue 11 Jan 2022 | 16 0-0 v Corinthian-CasualsCorinthian-Casuals 0-0 Harrow Borough | London County Cup First Round |
| 28 | Sat 29 Jan 2022 | 106-3 v Truro CityHarrow Borough 6-3 Truro City | Southern League - Premier South |
| 29 | Tue 1 Feb 2022 | 100-1 v Hayes & Yeading UnitedHarrow Borough 0-1 Hayes & Yeading United | Southern League - Premier South |
| 30 | Sat 5 Feb 2022 | 101-6 v Beaconsfield TownBeaconsfield Town 6-1 Harrow Borough | Southern League - Premier South |
| 31 | Sat 12 Feb 2022 | 110-1 v Kings LangleyHarrow Borough 0-1 Kings Langley | Southern League - Premier South |
| 32 | Tue 15 Feb 2022 | 102-4 v Hayes & Yeading UnitedHayes & Yeading United 4-2 Harrow Borough | Southern League - Premier South |
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