Nakhon Si Thammarat is a municipality in Southern Thailand.
Nakhon Si Thammarat may also refer to:
Nakhon Si Thammarat province, the province in which the municipality is located Mueang Nakhon Si Thammarat district, the capital district (amphoe mueang) of the province, in which the municality is located Nakhon Si Thammarat Kingdom, a historical kingdom Monthon Nakhon Si Thammarat, a historical administrative unit of the early 20th century and successor of the kingdom Nakhon Si Thammarat Range, a mountain range, also known as Banthat range