Languages of Thailand

Hmong (RPA: Hmoob) or Mong (RPA: Moob), known as First Vernacular Chuanqiandian Miao in China (Chinese: 川黔滇苗语第一土语; pinyin: Chuānqiándiān miáo yǔ dì yī tǔyǔ), is a dialect continuum of the West Hmongic branch of the Hmongic languages spoken by the Hmong of Sichuan, Yunnan, Guizhou, Guangxi, Hainan, northern Vietnam, Thailand, and Laos. There are some 2.7 million speakers of varieties that are largely mutually intelligible, including over 280,000 Hmong Americans as of 2013. Over half of all Hmong speakers speak the various dialects in China, where the Dananshan (大南山) dialect forms the basis of the standard language. However, Hmong Daw (White) and Mong Njua (Green) are widely known only in Laos and the United States; Dananshan is more widely known in the native region of Hmong.

Isan or Northeastern Thai (Thai: ภาษาอีสาน, ภาษาไทยถิ่นตะวันออกเฉียงเหนือ, ภาษาไทยถิ่นอีสาน, ภาษาไทยอีสาน, ภาษาลาวอีสาน) is a group of Lao varieties spoken in the northern two-thirds of Isan in northeastern Thailand, as well as in adjacent portions of northern and eastern Thailand. It is the native language of the Isan people, spoken by 20 million or so people in Thailand, a third of the population of Thailand and 80 percent of all Lao speakers. The language remains the primary language in 88 percent of households in Isan. It is commonly used as a second, third, or fourth language by the region's other linguistic minorities, such as Northern Khmer, Khorat Thai, Kuy, Nyah Kur, and other Tai or Austronesian-speaking peoples. The Isan language has unofficial status in Thailand and can be differentiated as a whole from the Lao language of Laos by the increasing use of Thai grammar, vocabulary, and neologisms. Code-switching is common, depending on the context or situation. Adoption of Thai neologisms has also further differentiated Isan from standard Lao.

Sgaw Karen or Sgaw Kayin, commonly known as Karen is a Sino-Tibetan language spoken by the Sgaw Karen people of Myanmar and Thailand. A Karenic branch of the Sino-Tibetan language family, Sgaw Karen is spoken by over a million people in Tanintharyi Region, Ayeyarwady Region, Yangon Region, and Bago Region in Myanmar, and about 200,000 in northern and western Thailand along the border near Kayin State. It is written using the S'gaw Karen alphabet, derived from the Burmese script although a Latin-based script is also in use among the Sgaw Karen in northwestern Thailand.

Northern Thai (Thai: ภาษาถิ่นพายัพ, ภาษาไทยถิ่นเหนือ; Phasa Thin Phayap), Lanna (Thai: ล้านนา), or Kam Mueang (Northern Thai: Thai: คำเมือง  ) is the language of the Northern Thai people of Lanna, Thailand. It is a Southwestern Tai language that is phonotactically closely related to Lao. Northern Thai has approximately six million speakers, most of whom live in the native Northern Thailand, with a smaller community of Lanna speakers in northwestern Laos.

The Shan language (Shan written: လိၵ်ႈတႆး, Shan spoken: ၵႂၢမ်းတႆး, or ၽႃႇသႃႇတႆး, Burmese: ရှမ်းဘာသာ, Thai: ภาษาไทใหญ่, ) is the native language of the Shan people and is mostly spoken in Shan State, Burma. It is also spoken in pockets of Kachin State in Burma, in Northern Thailand and decreasingly in Assam. Shan is a member of the Tai–Kadai language family and is related to Thai. It has five tones, which do not correspond exactly to Thai tones, plus a "sixth tone" used for emphasis. It is called Tai Yai or Tai Long in the Tai languages.

Kelantan-Pattani Malay, often referred to in Thailand as Yawi (in Thai) or Jawi (in Patani Malay), and in Kelantan as Baso Kelaté, is an Austronesian language of the Malayic subfamily spoken in the Malaysian state of Kelantan and the neighbouring southernmost provinces of Thailand. It is the primary spoken language of Thai Malays, but is also used as a lingua franca by ethnic Southern Thais in rural areas, Muslim and non-Muslim, and the samsam, a mostly Thai-speaking population of mixed Malay and Thai ancestry.

The Mon language (, Mon: ဘာသာ မန်; Burmese: မွန်ဘာသာ) is an Austroasiatic language spoken by the Mon people, who live in Myanmar and Thailand. Mon, like the related Khmer language or Vietic languages, but unlike most languages in mainland Southeast Asia, is not tonal. In recent years, usage of Mon has declined rapidly, especially among the younger generation. The Mon language is a recognised indigenous language in Myanmar as well as a recognised indigenous language of Thailand.

Lao, sometimes referred to as Laotian (ລາວ, 'Lao' or ພາສາລາວ, 'Lao language'), is a Kra–Dai language and the language of the ethnic Lao people. It is spoken in Laos, where it is the official language, as well as northeast Thailand, where it is usually referred to as Isan. Lao serves as a lingua franca among all citizens of Laos, who speak approximately 90 other languages, many of which are unrelated to Lao. Modern Lao (language) is heavily influenced by the Thai language. A vast number of technical terms as well as common usage are adopted directly from Thai.

Malay (mə-LAY; Malay: Bahasa Melayu, Jawi: بهاس ملايو) is an Austronesian language that is an official language of Brunei, Indonesia, Malaysia, and Singapore. It is also spoken in East Timor and southern part of Thailand. Altogether, it is spoken by 290 million people (around 260 million in Indonesia alone in its own literary standard named "Indonesian") across Maritime Southeast Asia.

Khmer (kə-MAIR; ខ្មែរ, UNGEGN: Khmêr) is an Austroasiatic language spoken natively by the Khmer people. This language is an official language and national language of Cambodia. The language is also widely spoken by Khmer people in Eastern Thailand and Isan, Thailand, also in Southeast and Mekong Delta of Vietnam.