| Official Name: | Ban Dai |
| Settlement Type: | Tambon |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type2: | Province |
| Subdivision Name2: | Chiang Rai |
| Subdivision Type3: | District |
| Subdivision Name3: | Mae Sai |
| Population As Of: | 2005 |
| Population Total: | 4,117 |
| Timezone: | ICT |
| Utc Offset: | +7 |
Ban Dai (Thai: ?) is a village and tambon (sub-district) of Mae Sai District, in Chiang Rai Province, Thailand.[1] In 2005 it had a population of 4,117 people. The tambon contains eight villages.