Mae Sariang (Thai: แม่สะเรียง, pronounced [mɛ̂ː sā.rīa̯ŋ]) is a small town and district (amphoe) on the narrow valley along Yuam River in Mae Hong Son province, northern Thailand, along the Myanmar border.

The areas around Mae Sariang are mountainous and forested; flat terrain that suits population or agriculture is scarce.

There are also Tai Yai or Shan people in the town center; they are among the first groups that inhabited the area.

Mae Sariang represents the westernmost area where Lanna culture and architecture dominated which also well assimilated with Burmese/ Shan.

Originally the district was named Mueang Yuam (เมืองยวม), which was changed in 1917 to Mae Sariang.