| Conflict: | Siege of Kojinyama |
| Partof: | the Sengoku period |
| Date: | 1544 |
| Place: | Kojinyama fortress, Shinano Province |
| Result: | Takeda victory |
| Combatant1: | forces of Takeda Shingen |
| Combatant2: | forces of Tozawa family |
| Commander1: | Takeda Shingen |
| Commander2: | Tozawa Yorichika |
| Strength1: | 2,000 |
| Strength2: | 2,000 |
In the 1544 siege of Kojinyama, Takeda Shingen continued his invasion of Shinano Province's Ima Valley, seizing Kojinyama fortress from the Tozawa family.