| 1 | Thu 22 Aug | 32-1 v HäckenHäcken 1-2 1 FC Heidenheim | UEFA Europa Conference League Play-off |
| 2 | Sun 25 Aug | 32-0 v FC St PauliFC St Pauli 0-2 1 FC Heidenheim | German Bundesliga |
| 3 | Sun 1 Sep | 34-0 v FC Augsburg1 FC Heidenheim 4-0 FC Augsburg | German Bundesliga |
| 4 | Fri 13 Sep | 32-4 v Borussia DortmundBorussia Dortmund 4-2 1 FC Heidenheim | German Bundesliga |
| 5 | Sat 21 Sep | 30-3 v SC Freiburg1 FC Heidenheim 0-3 SC Freiburg | German Bundesliga |
| 6 | Sat 28 Sep | 32-0 v Mainz 05Mainz 05 0-2 1 FC Heidenheim | German Bundesliga |
| 7 | Thu 3 Oct | 32-1 v Olimpija Ljubljana1 FC Heidenheim 2-1 Olimpija Ljubljana | UEFA Europa Conference League Matchday 1 |
| 8 | Sun 6 Oct | 30-1 v RB Leipzig1 FC Heidenheim 0-1 RB Leipzig | German Bundesliga |
| 9 | Sat 19 Oct | 3 2-3 v Borussia MönchengladbachBorussia Mönchengladbach 3-2 1 FC Heidenheim | German Bundesliga |
| 10 | Thu 24 Oct | 31-0 v PafosPafos 0-1 1 FC Heidenheim | UEFA Europa Conference League Matchday 2 |
| 11 | Sun 27 Oct | 30-0 v 1899 Hoffenheim1 FC Heidenheim 0-0 1899 Hoffenheim | German Bundesliga |
| 12 | Sat 2 Nov | 3 0-1 v Holstein KielHolstein Kiel 1-0 1 FC Heidenheim | German Bundesliga |
| 13 | Thu 7 Nov | 32-0 v Heart of MidlothianHeart of Midlothian 0-2 1 FC Heidenheim | UEFA Europa Conference League Matchday 3 |
| 14 | Sun 10 Nov | 31-3 v VfL Wolfsburg1 FC Heidenheim 1-3 VfL Wolfsburg | German Bundesliga |
| 15 | Sat 23 Nov | 32-5 v Bayer 04 LeverkusenBayer 04 Leverkusen 5-2 1 FC Heidenheim | German Bundesliga |
| 16 | Thu 28 Nov | 3 0-2 v Chelsea1 FC Heidenheim 0-2 Chelsea | UEFA Europa Conference League Matchday 4 |
| 17 | Sun 1 Dec | 30-4 v Eintracht Frankfurt1 FC Heidenheim 0-4 Eintracht Frankfurt | German Bundesliga |
| 18 | Sat 7 Dec | 32-4 v Bayern MunichBayern Munich 4-2 1 FC Heidenheim | German Bundesliga |
| 19 | Thu 12 Dec | 3 1-3 v İstanbul Başakşehirİstanbul Başakşehir 3-1 1 FC Heidenheim | UEFA Europa Conference League Matchday 5 |
| 20 | Sun 15 Dec | 3 1-3 v VfB Stuttgart1 FC Heidenheim 1-3 VfB Stuttgart | German Bundesliga |
| 21 | Thu 19 Dec | 31-1 v St Gallen1 FC Heidenheim 1-1 St Gallen | UEFA Europa Conference League Matchday 6 |
| 22 | Sun 22 Dec | 3 0-2 v VfL BochumVfL Bochum 2-0 1 FC Heidenheim | German Bundesliga |
| 23 | Sat 11 Jan | 32-0 v 1 FC Union Berlin1 FC Heidenheim 2-0 1 FC Union Berlin | German Bundesliga |
| 24 | Wed 15 Jan | 33-3 v Werder BremenWerder Bremen 3-3 1 FC Heidenheim | German Bundesliga |
| 25 | Sat 18 Jan | 30-2 v FC St Pauli1 FC Heidenheim 0-2 FC St Pauli | German Bundesliga |
| 26 | Sat 25 Jan | 31-2 v FC AugsburgFC Augsburg 2-1 1 FC Heidenheim | German Bundesliga |
| 27 | Sat 1 Feb | 31-2 v Borussia Dortmund1 FC Heidenheim 1-2 Borussia Dortmund | German Bundesliga |
| 28 | Sat 8 Feb | 30-1 v SC FreiburgSC Freiburg 1-0 1 FC Heidenheim | German Bundesliga |
| 29 | Thu 13 Feb | 32-1 v FC CopenhagenFC Copenhagen 1-2 1 FC Heidenheim | UEFA Europa Conference League Knockout Round |
| 30 | Sun 16 Feb | 30-2 v Mainz 051 FC Heidenheim 0-2 Mainz 05 | German Bundesliga |
| 31 | Thu 20 Feb | 3 1-3 v FC Copenhagen1 FC Heidenheim 1-3 FC Copenhagen | UEFA Europa Conference League Knockout Round |
| 32 | Sun 23 Feb | 3 2-2 v RB LeipzigRB Leipzig 2-2 1 FC Heidenheim | German Bundesliga |
| 33 | Sun 9 Mar | 31-1 v 1899 Hoffenheim1899 Hoffenheim 1-1 1 FC Heidenheim | German Bundesliga |
| 34 | Sun 16 Mar | 33-1 v Holstein Kiel1 FC Heidenheim 3-1 Holstein Kiel | German Bundesliga |
| 35 | Sat 29 Mar | 3 1-0 v VfL WolfsburgVfL Wolfsburg 0-1 1 FC Heidenheim | German Bundesliga |
| 36 | Sat 5 Apr | 3 0-1 v Bayer 04 Leverkusen1 FC Heidenheim 0-1 Bayer 04 Leverkusen | German Bundesliga |
| 37 | Sun 13 Apr | 30-3 v Eintracht FrankfurtEintracht Frankfurt 3-0 1 FC Heidenheim | German Bundesliga |
| 38 | Sat 19 Apr | 3 0-4 v Bayern Munich1 FC Heidenheim 0-4 Bayern Munich | German Bundesliga |
| 39 | Fri 25 Apr | 31-0 v VfB StuttgartVfB Stuttgart 0-1 1 FC Heidenheim | German Bundesliga |
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