Koga Domain
| Koga Domain 古河藩 | |
|---|---|
| under Tokugawa shogunate Japan | |
| 1590–1871 | |
| Capital | Koga Castle |
| • Type | Daimyō |
| Historical era | Edo period |
• Established | 1590 |
• Disestablished | 1871 |
| Today part of | part of Ibaraki Prefecture |
Koga Domain (古河藩, Koga-han) was a feudal domain under the Tokugawa shogunate of Edo period Japan. It is located in Shimōsa Province, Honshū. The domain was centered at Koga Castle, located in what is the city of Koga in Ibaraki Prefecture.