| Official Name: | Na Thawi |
| Native Name: | นาทวี |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Songkhla |
| Subdivision Type2: | Seat |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 69407 |
| Population As Of: | 2022 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 90160 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 9004 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 6.7417°N 100.6919°W |
Na Thawi (Thai: นาทวี, in Thai pronounced as /nāː tʰā.wīː/; Pattani Malay: นาวี, in Thai pronounced as /nāːwīː/) is a district (amphoe) in the southern part of Songkhla province, southern Thailand.
The area of Na Thawi was separated from Chana district and made a minor district (king amphoe) in 1957.
Neighboring districts are (from the west clockwise): Sadao, Chana, Thepha, and Saba Yoi. To the south is the state of Kedah, Malaysia.
The district is divided into 10 sub-districts (tambons), which are further subdivided into 92 villages (mubans). The township (thesaban tambon) Na Thawi covers parts of tambon Na Thawi. There are a further 10 tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | |
|---|---|---|---|---|---|
| 1. | Na Thawi | นาทวี | 17 | 16,678 | |
| 2. | Chang | ฉาง | 9 | 5,033 | |
| 3. | Na Mosi | นาหมอศรี | 8 | 3,115 | |
| 4. | Khlong Sai | คลองทราย | 8 | 6,055 | |
| 5. | Plak Nu | ปลักหนู | 7 | 5,098 | |
| 6. | Tha Pradu | ท่าประดู่ | 9 | 5,923 | |
| 7. | Sathon | สะท้อน | 10 | 7,682 | |
| 8. | Thap Chang | ทับช้าง | 10 | 7,115 | |
| 9. | Prakop | ประกอบ | 7 | 7,036 | |
| 10. | Khlong Kwang | คลองกวาง | 7 | 5,645 |