Chaiyaphum (Thai: ชัยภูมิ (Pronunciation)) is a town (thesaban mueang) in Northeastern Thailand, capital of Chaiyaphum province. As of 2015 it has a population of 58,350, and covers the full tambon Nai Mueang of Mueang Chaiyaphum district. Chaiyaphum is 337 road km northeast of Bangkok.

Chaiyaphum lies on the Khorat plateau at 185 metres (607 ft) above sea level. The land in the immediate vicinity of the city is quite flat, but the Phetchabun mountains rise to the west.

Chaiyaphum has a tropical savanna climate (Köppen climate classification Aw). Winters are dry and very warm. Temperatures rise until April, which is very hot with the average daily maximum at 36.4 °C (97.5 °F). The monsoon season runs from late April through October, with heavy rain and somewhat cooler temperatures during the day, although nights remain warm.