Phu Khiao Wildlife Sanctuary is a wildlife sanctuary in Thailand. It overlaps with three districts of Chaiyaphum province, namely Khon San, Kaset Sombun, and Nong Bua Daeng, covering 975,000 rai.
The wildlife sanctuary contains Thung Kamang, an extensive grassland covering an area of approximately 5,000 rai at an attitude of 900 metres above mean sea level. It features natural Arundinaria pusilla grassland on the undulated hills alternating with the forest line that make it look like continuous waves with many streams running through it and is surrounded with hill evergreen forest. This grassland is well-known as a breeding ground for endangered wildlife like hog deer, a medium-sized deer that is almost extinct in Thailand. Nowadays, they are distributed throughout the wildlife sanctuary. The surrounding area of Thung Kamang consists of many reservoirs.