| Official Name: | Chulabhorn |
| Native Name: | จุฬาภรณ์ |
| 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: | Sam Tambon |
| Subdivision Type3: | Subdistrict |
| Subdivision Type4: | Muban |
| Established Title: | District established |
| Population Total: | 31481 |
| Population As Of: | 2015 |
| Blank Name Sec1: | Postal code |
| Blank Info Sec1: | 80130 |
| Blank Name Sec2: | Geocode |
| Blank Info Sec2: | 8019 |
| Timezone: | ICT |
| Utc Offset: | +7 |
| Coordinates: | 8.075°N 99.87°W |
Chulabhorn (Thai: จุฬาภรณ์) is a district (amphoe) of Nakhon Si Thammarat province, southern Thailand.
The district was named in honour of Princess Chulabhorn, the youngest daughter of King Bhumibol Adulyadej, on her 36th birthday.
The district was created on 7 March 1994 by merging the two tambons, Ban Khuan Mut and Ban Cha-uat of Cha-uat district and the four tambons Khuan Nong Khwa, Thung Pho, Na Mo Bun, and Sam Tambon of Ron Phibun district.[1]
Neighboring districts are (from the north clockwise): Ron Phibun, Cha-uat, and Thung Song.
Chulabhorn is divided into six sub-districts (tambons), which are further subdivided into 30 administrative villages (mubans).
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There are five sub-district administrative organizations (SAO) in the district: