Pathio (Thai: ปะทิว, pronounced [pā.tʰīw]) is a district (amphoe) in the northern part of Chumphon province, southern Thailand.

Neighboring districts are (from the south clockwise) Mueang Chumphon, Tha Sae of Chumphon Province, and Bang Saphan Noi of Prachuap Khiri Khan province.

The area features numerous limestone caves and rock formations from the Mesozoic Era.

The main beach of Pathio is named Ao Bo Mao, translated as 'Spring Tree Bay', Wikimapia.

The district is divided into seven sub-districts (tambons), which are further subdivided into 70 villages (mubans).