| Thangmuchhyi थाङमुछ्यी | |
| Other Name: | Chepuwa |
| Native Name: | थाङमुछ्यी |
| Nickname: | Chhongdi(छोङदी) |
| Settlement Type: | Village development committee |
| Mapsize: | 300px |
| Pushpin Map: | Nepal |
| Pushpin Label Position: | bottom |
| Pushpin Mapsize: | 300 |
| Pushpin Map Caption: | Location in Nepal |
| Subdivision Type: | Country |
| Subdivision Name: |  Nepal |
| Subdivision Type1: | Zone |
| Subdivision Name1: | Kosi Zone |
| Subdivision Type2: | District |
| Subdivision Name2: | Sankhuwasabha District |
| Population As Of: | 1991 |
| Population Total: | 1949 |
| Population Density Km2: | auto |
| Population Blank1 Title: | Ethnicities |
| Timezone: | Nepal Time |
| Utc Offset: | +5:45 |
| Coordinates: | 27.77°N 87.52°W |
Thangmuchhyi (Chepuwa) is a village development committee in Sankhuwasabha District in the Kosi Zone of north-eastern Nepal. At the time of the 1991 Nepal census it had a population of 1949 people living in 425 individual households. Thangmuchhyi divided into 3 toles called Dhongdek, Syarkijong (Syarkidang) and Orokchhen and Gangdok and Chhulung also sub tole of Thangmuchhyi. People from Thangmuchhyi are mostly Nuppa clan of Lhomi. Among Nuppa also there are 3 main family groups called Mi-Ngo (Identity). Sonarinjen (Dhongtoek) Mi-Ngo, Ueohok (lower village) Mi-Ngo and Hamo Mi-Ngo. In Dhongtoek (upper household) tole, Sonarinjen clans are living and from Sonarinjen there were three brothers called Nangang Angchuk, Chhiyang Chhedar and Dhinakpa (real name forgotten).[1]
It borders Tibet, China.