| Yesan | |
| Native Name Lang: | ko |
| Translit Lang1: | Korean |
| Settlement Type: | County |
| Translit Lang1 Type1: | Hangul |
| Translit Lang1 Info1: | Korean: 예산군 |
| Translit Lang1 Type2: | Hanja |
| Translit Lang1 Info2: | Korean: {{linktext|禮|山|郡 |
| Translit Lang1 Info3: | Yesan-gun |
| Translit Lang1 Info4: | Yesan-gun |
| Subdivision Type: | Country |
| Subdivision Name: | South Korea |
| Subdivision Type1: | Region |
| Subdivision Name1: | Hoseo |
| Population Blank1 Title: | Dialect |
| Population Blank1: | Chungcheong |
| Area Total Km2: | 542.65 |
| Population As Of: | 2022 |
| Population Total: | 76651 |
| Population Density Km2: | 141.25 |
| Parts Type: | Administrative divisions |
| Parts: | 2 eup, 10 myeon |
| Image Blank Emblem: | Yesan logo.jpg |
| Blank Emblem Type: | Emblem of Yesan |
Yesan (pronounced as /ko/) is a county in South Chungcheong Province, South Korea. Famous people from Yesan include independence fighter Yoon Bong-Gil.
Sudeoksa, a head temple of the Jogye Order of Korean Buddhism, is located on the southern slopes of Deoksungsan in Deoksan-myeon, Yesan County. Its main hall is daeungjeon (Korean: 大雄殿), Korea's oldest wooden building and National Treasure 49.
In 2009, Yesan was designated a "slow city," one in which traditional cultures and communities are preserved.[1]