| Official Name: | Rai Oi |
| Native Name: | ไร่อ้อย |
| Settlement Type: | Tambon |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type2: | Province |
| Subdivision Name2: | Uttaradit |
| Subdivision Type3: | District |
| Subdivision Name3: | Phichai District |
| Population As Of: | 2005 |
| Population Total: | 6924 |
| Timezone: | ICT |
| Utc Offset: | +7 |
Rai Oi (Thai: ไร่อ้อย, in Thai pronounced as /râj ʔɔ̂j/) is a village and tambon (sub-district) of Phichai District, in Uttaradit Province, Thailand.[1] In 2005 it had a population of 6,924 people. The tambon contains 11 villages.