The Nakhon Si Thammarat Range (Thai: ทิวเขานครศรีธรรมราช, RTGS: Thio Khao Nakhon Si Thammarat, [tʰīw kʰǎw ná(ʔ).kʰɔ̄ːn sǐː tʰām.mā.râːt]) is a mountain range on the Malay Peninsula in southern Thailand, running in a north–south direction.

The main range of the peninsula begins along the east coast at about 10° 05′ north latitude on Ko Tao.

[1] The mountains are named after the town Nakhon Si Thammarat, located east of the range.

[2] It begins to the east of the Phuket Range, which runs in the same direction about 60 km further west.

Between the ranges there are isolated peaks, the highest of which is 1,350 m high Khao Phanom Bencha.