| Official Name: | Muang Yai |
| Settlement Type: | Tambon |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type2: | Province |
| Subdivision Name2: | Chiang Rai |
| Subdivision Type3: | District |
| Subdivision Name3: | Wiang Kaen |
| Population As Of: | 2005 |
| Population Total: | 7,449 |
| Timezone: | ICT |
| Utc Offset: | +7 |
Muang Yai (th|ม่วงยาย, pronounced as /th/) is a village and tambon (subdistrict) of Wiang Kaen District, in Chiang Rai Province, Thailand.[1] In 2005, it had a population of 7,449 people. The tambon contains nine villages.