| 2020-09-01 20:00:4201/09/20 | Thornaby v Bridlington Town | 2 - 0 | | 2020-21 | Teesdale Park | FA CupExtra Preliminary Round Qualifying | 260 |
| 2020-09-05 15:00:0005/09/20 | Thornaby v Billingham Town | 1 - 0 | Division 1 | 2020-21 | Teesdale Park | | 300 |
| Kallum Hannah (75) |
| 2020-09-09 19:45:0009/09/20 | Thornaby v Penrith | 1 - 2 | Division 1 | 2020-21 | Teesdale Park | | 150 |
| Lewis Murphy (4) |
| Kyle May (14) Max Brown (60) |
| 2020-09-12 15:00:0512/09/20 | Thornaby v Sunderland RCA | 0 - 2 | | 2020-21 | Teesdale Park | FA CupPreliminary Round Qualifying | 300 |
| Callum Hope (76) James Farley (79) |
| 2020-09-15 19:30:0015/09/20 | Ashington v Thornaby | 2 - 3 | Division 1 | 2020-21 | The dwmedia Stadium | | 300 |
| Dean Briggs (6) Ben Harmison (35) |
| Luke Drummand (45) Dale Hopson 2 (69, 90), Kallum Hannah missed pen (44) Dale Hopson missed pen (90) |
| 2020-09-26 15:00:0026/09/20 | Thornaby v Newton Aycliffe | 0 - 6 | Division 1 | 2020-21 | Teesdale Park | | 175 |
| Liam Jarvie (2) Jake Petitjean 2 (6, 82) Ethan Wood (13) Adam Burnicle 2 (22 pen, 82) |
| 2020-09-30 19:30:0030/09/20 | Thornaby v Newcastle Benfield | 3 - 3 | Division 1 | 2020-21 | Teesdale Park | | 140 |
| Kallum Hannah (20) James Frazer (51) Bobby Rye (61) |
| Paul Bryson (9 pen) Aidan Haley (40) Abubaker Salim (47) |
| 2020-10-03 15:00:0003/10/20 | Northallerton Town v Thornaby | 0 - 0 | Division 1 | 2020-21 | The Calvert Stadium | | 171 |
| 2020-10-06 19:30:0006/10/20 | Whitley Bay v Thornaby | 1 - 3 | Division 1 | 2020-21 | Hillheads Park | | 150 |
| Adam Shanks (17) |
| Dale Hopson (27 pen) Elliott Beddows 2 (49, 77) |
| 2020-10-10 15:00:5410/10/20 | Newcastle University v Thornaby | 4 - 1 | | 2020-21 | Kimberley Park | FA VaseSecond Qualifying Round | 90 |
| Niza Chilufya 3 (10, 41, 47) Blake Wood (28) |
| Kallum Hannah (75), Reece Kenney sent off |
| 2020-10-14 19:45:0014/10/20 | Guisborough Town v Thornaby | 1 - 2 | Division 1 | 2020-21 | King George V Ground | | 282 |
| Christian Selby (94 pen), Sonni Coleman sent off (51) |
| Peter Bulmer (35) Joseph Carter (71), Callum Hannah sent off (after final whistle) |
| 2020-10-17 15:00:0017/10/20 | Seaham Red Star v Thornaby | 1 - 2 | Division 1 | 2020-21 | The Ferguson Motor Repairs Stadium | | 150 |
| Lewis Suddick (60) |
| Bobby Pye (5) Elliott Bedden (25), Austin Johnston sent off (65) |
| 2020-10-21 19:30:0021/10/20 | Thornaby v Sunderland RCA | 2 - 1 | Division 1 | 2020-21 | Teesdale Park | | 175 |
| Bobby Rye (36), Dale Hopson (43 pen) |
| James Fairley (80) |
| 2020-10-24 15:00:0024/10/20 | Thornaby v Shildon | 2 - 5 | Division 1 | 2020-21 | Teesdale Park | | 251 |
| Dale Hopson (58) Jamie Davis (65) |
| Dean Thexton 2 (4, 48) Aidan Heywood (14) Jamie Poole (46 og) Ben Trotter (87) |
| 2020-12-05 15:00:0005/12/20 | Thornaby v Stockton Town | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2020-12-08 19:30:0008/12/20 | Sunderland Ryhope C.W. v Thornaby | 19:30:007:30 pm | Division 1 | 2020-21 | Ryhope Recreation Ground | | |
| 2020-12-12 15:00:0012/12/20 | Thornaby v Hebburn Town | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2020-12-19 15:00:0019/12/20 | Penrith v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | The Frenchfield Stadium | | |
| 2020-12-26 12:00:0026/12/20 | Billingham Town v Thornaby | 12:00:0012:00 pm | Division 1 | 2020-21 | Bedford Terrace | | |
| 2020-12-28 12:00:0028/12/20 | Thornaby v Seaham Red Star | 12:00:0012:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-01-02 15:00:0002/01/21 | Shildon v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | Dean Street | | |
| 2021-01-09 15:00:0009/01/21 | Thornaby v Ashington | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-01-16 15:00:0016/01/21 | Sunderland RCA v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | Sunderland LGV Park | | |
| 2021-01-23 15:00:0023/01/21 | Newcastle Benfield v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | Sam Smith's Park | | |
| 2021-01-30 15:00:0030/01/21 | Thornaby v Whitley Bay | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-02-13 15:00:0013/02/21 | Thornaby v Guisborough Town | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-02-20 15:00:0020/02/21 | Hebburn Town v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | The Green Energy Sports Ground | | |
| 2021-02-27 15:00:0027/02/21 | Thornaby v Northallerton Town | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-03-06 15:00:0006/03/21 | Consett v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | Belle View Stadium | | |
| 2021-03-13 15:00:0013/03/21 | Thornaby v West Auckland Town | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-03-20 15:00:0020/03/21 | Whickham v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | Glebe Sports Ground | | |
| 2021-03-27 15:00:0027/03/21 | Thornaby v North Shields | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-03-31 19:30:0031/03/21 | Thornaby v Consett | 19:30:007:30 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-04-03 15:00:0003/04/21 | Bishop Auckland v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | Heritage Park | | |
| 2021-04-17 15:00:0017/04/21 | Stockton Town v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | The Map Group UK Stadium | | |
| 2021-04-20 19:30:0020/04/21 | West Auckland Town v Thornaby | 19:30:007:30 pm | Division 1 | 2020-21 | Wanted Stadium | | |
| 2021-04-24 15:00:0024/04/21 | Thornaby v Sunderland Ryhope C.W. | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-04-27 19:45:0027/04/21 | Newton Aycliffe v Thornaby | 19:45:007:45 pm | Division 1 | 2020-21 | The Beaumont Landscapes Stadium | | |
| 2021-05-01 15:00:0001/05/21 | Thornaby v Whickham | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
| 2021-05-08 15:00:0008/05/21 | North Shields v Thornaby | 15:00:003:00 pm | Division 1 | 2020-21 | Daren Persson Stadium | | |
| 2021-05-15 15:00:0015/05/21 | Thornaby v Bishop Auckland | 15:00:003:00 pm | Division 1 | 2020-21 | Teesdale Park | | |
