| Ulsan Castle | |
| Nativename-A: | 울산왜성 |
| Location: | Ulsan, Republic of Korea |
| Type: | Japanese castle (Waeseong) |
| Height: | 6 m |
| Built: | 1597 |
| Builder: | Kato Kiyomasa |
| Used: | 1593-1598 |
| Materials: | stone, wood, plaster walls |
| Past Commanders: | Kato Kiyomasa, Asano Yoshinaga |
| Color: |
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| Hangul: | 울산왜성 |
| Rr: | Ulsan Waeseong |
| Mr: | Ulsan Waesŏng |
Ulsan Castle (울산왜성,) is a Japanese style castle in Ulsan, South Korea which was constructed during the Japanese invasions of Korea (Imjin war) by Katō Kiyomasa's army. Today, Ulsan Castle is almost ruined by the city planning of Ulsan.
Ulsan Japanese Castle was excluded from Historic Sites of South Korea on October 30, 1997.
