Thung Song (Thai: ทุ่งสง, pronounced [tʰûŋ sǒŋ]) is a district (amphoe) in the southwestern part of Nakhon Si Thammarat province, southern Thailand.

Neighboring districts are (from the west clockwise): Bang Khan, Thung Yai, Na Bon, Chang Klang, Lan Saka, Ron Phibun, Chulabhorn, and Cha-uat of Nakhon Si Thammarat province; Huai Yot and Ratsada of Trang province.

Thung Song is a town (thesaban mueang) covering tambon Pak Phraek.

[2] The government's goal is clear according to one observer: "...maintaining a firm grip on central control and suppressing local forest management efforts which will dilute their power.

About 20 years ago, there were less than 10 deer in the Ban Nuea forest, a result of the conservation efforts of the villagers.