| Conflict: | Siege of Ingolstadt |
| Partof: | the Schmalkaldic War |
| Date: | September 1546 |
| Place: | Ingolstadt |
| Result: | Catholic victory |
| Combatant1: | Protestant Schmalkaldic troops |
| Combatant2: | Catholic Imperial army City of Ingolstadt |
| Strength1: | Unknown (numerous) |
| Strength2: | Unknown (smaller) |
| Casualties1: | Unknown |
| Casualties2: | Unknown (few) |
The Battle of Ingolstadt (de|Schlacht bei Ingolstadt) of 1546 was a short-lived siege commitment by the Protestant forces of the Schmalkaldic League directed against the smaller imperial Catholic troops consisting of the locals from the town itself and the surrounding Bavarian countryside. It resulted in the withdrawal of the Schmalkaldeners.
In 1537, Ingolstadt was expanded into the Bavarian state fortress of Ingolstadt, which it remained for 400 years, with a brief interruption. This earned the city the name "Schanz" and even today many Ingolstadt residents call themselves "Schanzer". Under Count Solms, Lord of Münzberg, a Renaissance fortress with bulwarks was built, although the medieval city wall was preserved. The construction phase lasted until around 1565. Before the work was even finished, in 1546, during the Schmalkaldic War, the troops of the Schmalkaldic League and the imperial troops of Charles V faced each other in front of the city gates for two weeks. With the withdrawal of the Schmalkaldeners, the fortress had passed its first test.[1]