| Goesan | |
| Native Name Lang: | ko |
| Translit Lang1: | Korean |
| Settlement Type: | County |
| Translit Lang1 Type1: | Hangul |
| Translit Lang1 Info1: | Korean: 괴산군 |
| Translit Lang1 Type2: | Hanja |
| Translit Lang1 Info2: | Korean: {{linktext|槐|山|郡 |
| Translit Lang1 Info3: | Goesan-gun |
| Translit Lang1 Info4: | Koesan-gun |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Hoseo |
| Population Blank1 Title: | Dialect |
| Population Blank1: | Chungcheong |
| Area Total Km2: | 842 |
| Population Total: | 44461 |
| Population Density Km2: | 52.8 |
| Parts Type: | Administrative divisions |
| Parts: | 1 eup and 10 myeon |
| Image Blank Emblem: | Goesan logo.png |
| Blank Emblem Type: | Emblem of Goesan |
Goesan County is a county in North Chungcheong Province, South Korea.
As of 2021, Goesan-gun has a population of about 40,000 people.[1] The area has been affected strongly by the graying of the South Korean population, and more than a third of residents are over the age of 65. Schools have closed as urbanization and falling birthrates in Korea have resulted in a declining number of children to attend them. One school, to prevent closure due to low enrollment, offers free housing to families with school-age children.
Sanmagi-yetgil is a 5km (03miles) road that extends from Sao-rang-maeul village (Oe-sa-ri, Chilseong-myeon, Goesan-gun, Chungbuk) to Sanmagi village in the mountains. It is a stroll path restored to resemble the traditional mountain road with a picturesque landscape.[2]
Goesan is twinned with: