Khanom (Thai: ขนอม, pronounced [kʰā.nɔ̌ːm]) is the northernmost district (amphoe) of Nakhon Si Thammarat province, southern Thailand.

Neighboring districts are (from the south clockwise) Sichon of Nakhon Si Thammarat and Don Sak of Surat Thani.

Most of the coast line of district will be protected as part of the Hat Khanom - Mu Ko Thale Tai National Park, which is in the process of creation.

The coast of the district consists of a series of beaches among the limestone and shale mountains of northern Nakhon Si Thammarat Range.

[2] On 1 March 1939 it was made a minor district (king amphoe), consisting of the two tambons Khanom and Thong Nian.