| Official Name: | Ban Fai |
| Native Name: | บ้านฝาย |
| Settlement Type: | Tambon |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type2: | Province |
| Subdivision Name2: | Uttaradit |
| Subdivision Type3: | District |
| Subdivision Name3: | Nam Pat District |
| Population As Of: | 2005 |
| Population Total: | 7458 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 17.7697°N 100.7251°W |
Ban Fai (Thai: บ้านฝาย, in Thai pronounced as /bâːn fǎːj/) is a village and tambon (sub-district) of Nam Pat District, in Uttaradit Province, Thailand.[1] In 2005, it had a population of 7,458 people. The tambon contains eight villages.