Kasong, also previously known as "Chong of Trat", is an endangered Pearic language of the Austroasiatic family spoken in Bo Rai District, ^[2] Trat Province of Thailand. ^[3] On the basis of lexical similarity determined with a relatively short word list, Kasong has been classified as a dialect of Central Chong. ^[4] However, further study and longer word lists point to Kasong being a separate language closely related to Chong and Samre. ^{[3] [2]} Kasong is nearly extinct; there are no monolinguals and all speakers use Thai as their primary language.

Of the vocabulary tested, a study found 55.38 percent of the language to consist of Thai loanwords. ^[3] These loanwords are grouped into two subtypes: direct from Thai or a Thai word added to an existing Kasong word. ^[3] This high percentage is indicative of the language's route to potential extinction as Thai displaces it.

More than 50 years ago,^{[ when?]} all Kasong people were forbidden to use the Kasong language in their families and with others as a result of governors believing that speaking Kasong interfered with speaking Thai. ^[3] Thus, Kasong speakers taught their descendants Thai instead of Kasong. ^[3] Thai nationalism led to the Kasong people becoming ashamed of their language and not being concerned with its preservation. ^[3] The Kasong language and its people is representative of Thailand's many ethnolinguistic minorities. ^[5]

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