Tat Mok National Park is a national park in Phetchabun Province, Thailand. Established on 30 October 1998, it is the 87th national park in Thailand. Both park and the waterfall are named after Tat Mok Mountains.

Phetchabun is one of Thailand's seventy-six provinces (changwat) lies in lower northern Thailand. Neighbouring provinces are Loei, Khon Kaen, Chaiyaphum, Lopburi, Nakhon Sawan, Phichit and Phitsanulok.