| Kosan County | |
| Native Name Lang: | ko |
| Settlement Type: | County |
| Translit Lang1 Type: | Chosŏn'gŭl |
| Translit Lang1 Info: | 고산군 |
| Translit Lang1: | Korean |
| Translit Lang1 Type1: | Hancha |
| Translit Lang1 Info2: | Kosan-gun |
| Translit Lang1 Info3: | Gosan-gun |
| Subdivision Type: | Country |
| Subdivision Name: | North Korea |
| Subdivision Type1: | Province |
| Subdivision Name1: | Kangwŏn Province |
| Area Total Km2: | 435 |
| Population As Of: | 2008[1] |
| Population Total: | 103,579 |
| Population Density Km2: | auto |
| Parts Type: | Administrative divisions |
| Parts: | 1 ŭp, 24 ri |
Kosan County is a kun, or county, in Kangwŏn province, North Korea.
The county is predominantly mountainous, with a central basin. Its highest point is Chuaesan. Major streams include the Namdaech'ŏn, Ryongjiwŏnch'ŏn, and Namsanch'ŏn. The county contains 13 reservoirs, and Forestland covers approximately 63.8% of its area.
Kosan county is divided into 1 ŭp (town) and 24 ri (villages):
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Agriculture dominates local industry in Kosan, with crops including rice, maize, millet, wheat, barley, soybeans, and red beans. The region is particularly noted for its abundant production of fruit.
Mining is widely developed, exploiting the local deposits of gold, silver, copper, iron, limestone, lead, zinc, gypsum, and other minerals.
Kosan county is served by the Kangwŏn Line of the Korean State Railway.