| Doksan Fortress | |
| Native Name: | 禿山城 독산성 |
| Native Language: | Korean |
| Coordinates: | 37.1836°N 127.0194°W |
| Type: | Hill Fort |
| Location: | Osan, South Korea |
| Area: | 75,254m2[1] |
| Built: | Before 373 (Baekje period) |
| Rebuilt: | 1602 (as a stone fortress) |
| Restored: | 1950s, 1980s |
| Designation1: | Historic Sites of South Korea |
| Designation1 Offname: | Doksanseong Fortress and Semadae Site, Osan |
| Designation1 Date: | 29 August 1964 |
| Designation1 Number: | 140 |
| Designation2: | Local Cultural Assets of Hwaseong City |
| Designation2 Offname: | Bujeksa |
| Designation2 Type: | Local Cultural Heritage |
| Designation2 Date: | 20 May 1986 |
| Delisted2 Date: | 1 January 1989 |
| Designation2 Partof: | Doksanseong Fortress and Semadae Site, Osan |
| Designation2 Number: | 8 |
Doksan Fortress is a Korean hill fort located in Osan, South Korea. It is notable for the Siege of Doksan in 1593, during which the Japanese forces failed to defeat Gwon Yul in the Imjin War. Within the fort, there are significant landmarks such as the Bujek Buddhist Temple and Semadae, a monument commemorating Gwon Yul's victory. The site is designated as a Historic Site of South Korea.[2] Each September, the annual Doksanseong Culture and Art Festival takes place near the fort.