| Official Name: | Khun Yuam |
| Native Name: | ขุนยวม |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Mae Hong Son |
| Subdivision Type2: | Seat |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 21479 |
| Population As Of: | 2005 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 58140 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 5802 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 18.8394°N 97.9514°W |
Khun Yuam (Thai: ขุนยวม, in Thai pronounced as /kʰǔn jūam/; ขุนยวม, pronounced as /kʰǔn ɲūam/) is a district (amphoe) of Mae Hong Son province, northern Thailand.
Mueang Khun Yuam was made a district (amphoe) in 1910. Khun Det Pracharak (ขุนเดชประชารักษ์) was the first head of district.
Neighboring districts are (from north clockwise): Mueang Mae Hong Son of Mae Hong Son Province, Mae Chaem of Chiang Mai province, Mae La Noi of Mae Hong Son Province, and Kayah State of Myanmar.
The Yuam River and the Mae Surin Waterfall in Namtok Mae Surin National Park are in the district.
The district is divided into six sub-districts (tambons), which are further subdivided into 45 villages (mubans). Khun Yuam is also a township (thesaban tambon) covering parts of tambon Khun Yuan. There are a further four tambon administrative organizations (TAO) and two tambon administrations (TA).
| No. | Name | Thai name | Villages | Pop. | ||
|---|---|---|---|---|---|---|
| 1. | Khun Yuam | ขุนยวม | 6 | 6,823 | ||
| 2. | Mae Ngao | แม่เงา | 10 | 3,068 | ||
| 3. | Mueang Pon | เมืองปอน | 10 | 4,437 | ||
| 4. | Mae Yuam Noi | แม่ยวมน้อย | 8 | 2,464 | ||
| 5. | Mae Ki | แม่กิ๊ | 5 | 1,404 | ||
| 6. | Mae Ukho | แม่อูคอ | 6 | 3,283 |