Thai (ภาษาไทย/Thịy p̣hās̄ʹā), a Tai-Kadai language spoken by about 65 million people mainly in Thailand (ประเทศไทย), and also in the Midway Islands, Singapore, the UAE and the USA.

Thai is closely related to Lao, and northern dialects of Thai are more or less mutually intelligible with Lao, particularly the Lao spoken in northern Thailand. Thai vocabulary includes many words from Pali Sanskrit and Old Khmer.

The Thai alphabet can also be used to write Sanskrit, Pali and a number of related languages.