| Official Name: | Hat Yai |
| Native Name: | หาดใหญ่ |
| 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: | 404044 |
| Population As Of: | 2021 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 90110 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 9011 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 7.0019°N 100.4572°W |
| Footnotes: | [1] |
Hat Yai (Thai: หาดใหญ่, in Thai pronounced as /hàːt jàj/) is a district (amphoe) of Songkhla province, southern Thailand.
Neighboring districts are (from the west clockwise): Khuan Kalong of Satun province; Rattaphum, Bang Klam, Khuan Niang, Singhanakhon, Mueang Songkhla, Na Mom, Chana, Sadao, and Khlong Hoi Khong.
The northeastern part of the district is on the shore of the Songkhla Lake.
The district is divided into 13 sub-districts (tambons), which are further subdivided into 98 villages (mubans). The city (thesaban nakhon) Hat Yai covers tambon Hat Yai. There are four towns (thesaban mueang): Ban Phru covers parts of tambon Ban Phru, and Khlong Hae, Khuan Lang and Kho Hong each cover tambons of the same names. There is further one township (thesaban tambon). Pha Tong covers parts of tambon Pha Tong. The non-municipal areas are administered by nine tambon administrative organizations (TAO).
| No. | Name | Thai name | Villages | Pop. | |
|---|---|---|---|---|---|
| 1. | Hat Yai | หาดใหญ่ | - | 158,412 | |
| 2. | Khuan Lang | ควนลัง | 6 | 42,266 | |
| 3. | Khu Tao | คูเต่า | 10 | 11,015 | |
| 4. | Kho Hong | คอหงส์ | 8 | 44,916 | |
| 5. | Khlong Hae | คลองแห | 11 | 32,553 | |
| 7. | Khlong U Taphao | คลองอู่ตะเภา | 4 | 2,820 | |
| 8. | Chalung | ฉลุง | 6 | 7,285 | |
| 11. | Thung Yai | ทุ่งใหญ่ | 6 | 5,131 | |
| 12. | Thung Tamsao | ทุ่งตำเสา | 10 | 16,053 | |
| 13. | Thakham | ท่าข้าม | 8 | 7,933 | |
| 14. | Nam Noi | น้ำน้อย | 10 | 13,470 | |
| 16. | Ban Phru | บ้านพรุ | 11 | 29,610 | |
| 18. | Phatong | พะตง | 8 | 13,530 |