Phu Thok (ภูทอก, also spelled Phu Tok), meaning 'lonely mountain' in the Isan language, is a 359 m high isolated hill in the northeastern end of Isan, Thailand.

It is in Na Sabaeng Subdistrict, Si Wilai District, at the centre of Bueng Kan Province.

Phu Thok is an emblematic sandstone outcrop that is both a local landmark and the symbol of the province of Bueng Kan.

[3] Wat Phu Thok, an important Buddhist temple, is in a cave near the top of the smaller peak.

[4] The summit of this massive rocky hill can be reached via a wooden walkway.