Grahi inscription (; ), or officially Than Phra Phuttharup Wat Hua Wiang Inscription (; ) is an inscription found in Chaiya, southern Thailand, written in Old Khmer language with Old Sumatran script, and dated to 1183 CE. The five-line inscription is written on the pedestal of a bronze Buddha statue that was discovered in 1904 at Wat Wiang temple in Chaiya and was stored at Wat Hua Wiang temple. The Buddha statue is currently a collection of Bangkok National Museum. The name Grahi, called Kia-lo-hi in the Chinese Zhu Fan Zhi record, is considered to be the old name of Chaiya. The city was part of Tambralinga, once a border polity between Srivijaya and Khmer kingdoms in the Malay Peninsula.
Older names of the inscription as registered in Thai official records include S.D.9 and 25th inscription; at the base of Wat Hua Wiang's Buddha statue.
The transliteration of the inscription according to Cà Âdès is as follows:
The approximate translation of the inscription is as follows: