| Official Name: | Mueang Nakhon Si Thammarat district |
| Native Name: | อำเภอเมืองนครศรีธรรมราช |
| Native Name Lang: | th |
| Settlement Type: | District |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Nakhon Si Thammarat |
| Subdivision Type2: | Seat |
| Subdivision Name2: | Nai Mueang |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 266,613 |
| Population As Of: | 2009 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 80000 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 8001 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 8.42°N 99.9633°W |
Mueang Nakhon Si Thammarat (Thai: อำเภอเมืองนครศรีธรรมราช, in Thai pronounced as /mɯ̄a̯ŋ ná(ʔ).kʰɔ̄ːn sǐː tʰām.mā.râːt/) is the capital district (amphoe mueang) of Nakhon Si Thammarat province in southern Thailand.
Neighboring districts are (from the southeast clockwise): Pak Phanang, Chaloem Phra Kiat, Phra Phrom, Lan Saka, Phrom Khiri and Tha Sala. To the east is the Gulf of Thailand.
The district is divided into 16 sub-districts (tambons), which are further subdivided into 114 villages (mubans).
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Nakhon Si Thammarat itself has city status (thesaban nakhon) and covers tambons Nai Mueang, Tha Wang, Khlang, and parts of Na Khian and Pho Sadet. There are a further three townships (thesaban tambons): Bang Chak covering parts of the same-named tambon, Tha Phae covering parts of tambon Pak Phun, and Pak Nakhon covering parts of tambons Tha Rai and Pak Nakhon. There are also 13 tambon administrative organizations (TAO).