The Phu Phan mountains (Thai: ทิวเขาภูพาน, RTGS: Thio Khao Phu Phan, pronounced [tʰīw kʰǎw pʰūː pʰāːn]; Northeastern Thai: ทิวเขาภูพาน Thio Khao Phu Phan, pronounced [tʰîw kʰǎw pʰûː pʰâːn]) are a range of hills dividing the Khorat Plateau of the Isan region of Thailand into two basins: the northern Sakhon Nakhon Basin, and the southern Khorat Basin.

[1] The silhouette of the Phu Phan Mountains appears in the provincial seal of Kalasin since they form the northern boundary of the province.

[2] The Phu Phan mountains are among the places in Thailand more severely affected by the Illegal logging of Phayung (Siamese Rosewood) trees.

[3][4] The name of the range is derived from the characteristic tabletop shape of its peaks, for phan is a kind of traditional tray on a pedestal.

[8] Other local sights are Lake Nong Han near Sakon Nakhon and the Khmer-style chedi ruins of Phu Phek, dating from 1050.