| Official Name: | Sena |
| Native Name: | เสนา |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Phra Nakhon Si Ayutthaya |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Sena |
| Subdivision Type3: | Tambon |
| Subdivision Name3: | 17 |
| Subdivision Type4: | Muban |
| Subdivision Name4: | 132 |
| Established Title: | District established |
| Population Total: | 66670 |
| Population As Of: | 2012 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 13110 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 1412 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 14.3272°N 100.4044°W |
Sena (Thai: เสนา, in Thai pronounced as /sěːnāː/) is a district (amphoe) in Phra Nakhon Si Ayutthaya province, central Thailand. Local people typically know the populated centre of Sena as Ban Phaen (Thai: บ้านแพน).[1]
Neighboring districts are (from the north clockwise) Phak Hai, Bang Ban, Bang Sai (Thai: บางไทร), Lat Bua Luang and Bang Sai (Thai: บางซ้าย) of Ayutthaya Province.
The district is divided into 17 sub-districts (tambon), which are further subdivided into 132 administrative villages (muban). Sena is a town covering the whole Sena sub-district. There are four sub-district municipalities (thesaban tambon) − Sam Ko and Bang Nom Kho cover the whole same-named sub-district, Hua Wiang the whole sub-district Hua Wiang and Ban Krathum, and Chao Chet the whole sub-district Chao Sadet and parts of the sub-district Chao Chet and Ban Thaeo. There are a further nine tambon administrative organizations as the local government for the sub-districts not part of a municipality.
| No. | Name | Thai | Pop.[2] | |
|---|---|---|---|---|
| 1. | Sena | เสนา | 4,103 | |
| 2. | Ban Phaen | บ้านแพน | 3,370 | |
| 3. | Chao Chet | เจ้าเจ็ด | 4,729 | |
| 4. | Sam Ko | สามกอ | 7,003 | |
| 5. | Bang Nom Kho | บางนมโค | 7,127 | |
| 6. | Hua Wiang | หัวเวียง | 4,236 | |
| 7. | Manwichai | มารวิชัย | 2,556 | |
| 8. | Ban Pho | บ้านโพธิ์ | 3,456 | |
| 9. | Rang Chorakhe | รางจรเข้ | 2,753 | |
| 10. | Ban Krathum | บ้านกระทุ่ม | 2,122 | |
| 11. | Ban Thaeo | บ้านแถว | 4,084 | |
| 12. | Chai Na | ชายนา | 4,880 | |
| 13. | Sam Tum | สามตุ่ม | 4,692 | |
| 14. | Lat Nga | ลาดงา | 3,437 | |
| 15. | Don Thong | ดอนทอง | 2,444 | |
| 16. | Ban Luang | บ้านหลวง | 2,844 | |
| 17. | Chao Sadet | เจ้าเสด็จ | 2,834 |