| Conflict: | Siege of Gogenyama |
| Partof: | the Sengoku period |
| Date: | 1510 |
| Place: | Gogen-yama Castle, Kanagawa Prefecture |
| Result: | Uesugi victory |
| Combatant1: | forces of Ueda Masamori |
| Combatant2: | forces of Uesugi Tomoyoshi |
| Commander1: | Ueda Masamori |
| Commander2: | Uesugi Tomoyoshi |
The siege of Gongenyama (権現山の戦い) occurred in 1510 during the Sengoku period of Japan's history. The daimyō Uesugi Tomoyoshi (上杉朝良; died 1518) had a retainer Ueda Masamori (上田政盛) who rebelled against him and laid siege to his castle of Gongenyama. Masamori was defeated.[1]