| Hangul: | 구주성 |
| Hanja: | 龜州城 |
| Rr: | Gujuseong |
| Mr: | Kujusŏng |
| Context: | north |
The Kuju Castle is a military fortress[1] from the Goryeo period, located in Kusong, North Korea.
The fortress was the site of the defeat of the Khitan invasion in 1018 under the command of Kang Kam-ch'an.[1] The site is number 60 on the list of National Treasure of North Korea.