What language is spoken in Thailand?

The short answer: Thai

Walk into a 7-Eleven anywhere from Chiang Rai to Phuket and you'll be greeted in Thai: สวัสดีค่ะsà-wàt-dii kâ. Standard Thai, called ภาษาไทยpaa-sǎa tai in Thai and sometimes Central Thai or Siamese in English, is the national language. It's the language of school, television, the news, road signs, government forms and pop music, and it's what Thais from different regions use with each other and with strangers.

But Thailand is not a one-language country. Ethnologue, the standard catalogue of the world's languages, lists 52 living indigenous languages in Thailand, plus 27 non-indigenous ones (2026 edition). In its 2011 report to the UN committee on racial discrimination, the Thai government recognised 62 ethnolinguistic groups from five language families. For a visitor or learner, though, the picture is simpler: one national language and four big regional ones.

Thailand's languages at a glance

Speaker numbers are the home-language figures from the Thai government's 2011 report; Ethnologue gives similar numbers. Most speakers of the regional languages also speak standard Thai.

• Central Thai (standard Thai): Bangkok and the central plains. About 20 million home speakers in the 2011 report (Ethnologue's 2024 estimate is about 27 million), and understood by almost everyone in the country. This is the Thai that courses, including ours, teach.
• Isan (Northeastern Thai): the 20 provinces of the northeast, such as Khon Kaen, Udon Thani and Ubon Ratchathani. About 15 million speakers. Linguistically a form of Lao, written in Thai script.
• Northern Thai (คำเมืองkam-mueang, Kham Mueang): Chiang Mai, Chiang Rai, Lampang and the rest of the old Lanna kingdom. About 6 million speakers. It has its own traditional script, which you'll still see on temples.
• Southern Thai (ปักษ์ใต้bpàk-dtâai, Pak Tai): from Chumphon down to Songkhla, including Surat Thani, Krabi and the islands. About 4.5 million speakers, famous for its fast, clipped sound.
• Patani Malay (Yawi): Pattani, Yala and Narathiwat in the far south. About 1.4 million speakers, mostly Malay Muslims. Close to the Malay of Kelantan in Malaysia.
• Northern Khmer: Surin, Buriram and Sisaket, near Cambodia. About 1.4 million speakers.
• Chinese languages: Teochew above all, plus Hokkien, Hainanese, Hakka and Cantonese, mainly among older Thai-Chinese families.
• Hill-tribe languages: Karen, Hmong, Mien, Lahu, Lisu, Akha and others in the northern and western mountains.
• Thai Sign Language, the language of the Deaf community, and the languages of migrant workers, especially Burmese, Khmer and Lao.

Isan, Northern and Southern Thai belong to the same Tai branch of the Kra-Dai family as standard Thai, so they share a lot of grammar and basic vocabulary. The Thai state has long called them "dialects" of Thai; many linguists treat them as separate languages. Either way, the differences are big enough that a Bangkok Thai can struggle to follow a fast conversation in Isan or Southern Thai.

One language, several registers

Even standard Thai comes in layers, and you'll hear them all. The word "eat" shows it best:

• กินgin: everyday, with friends, at the market. This is the one to learn first.
• ทานtaan: a little more polite, common in service and with older people.
• รับประทานráp-bprà-taan: formal, written, on signs and in speeches.
• เสวยsà-wǒei: royal vocabulary, used only for the king and the royal family.

That last layer, ราชาศัพท์raa-chaa-sàp or royal vocabulary, is a whole set of special words used when talking about the royal family. You'll hear it on the evening news, and Thais don't expect you to use it. For daily life, everyday spoken Thai with polite particles is exactly right.

Spot the difference: the same words in four regions

Here is how a few everyday words change across the country. The romanization shows how a Bangkok speaker would read the spelling; regional tones differ, so treat it as a guide only.

• Delicious: Central อร่อยà-ràwy · Northern ลำlam · Isan แซ่บsâep · Southern หรอยrǎwy
• To speak: Central พูดpûut · Northern อู้ûu · Isan เว้าwáo · Southern แหลงlǎeng
• Is it tasty?: Central อร่อยไหมà-ràwy mǎi · Northern ลำก่อlam gàw · Isan แซ่บบ่sâep bàw
• Not: Central ไม่mâi · Northern and Isan บ่bàw
• Thank you: Central ขอบคุณkàwp-kun · Northern ยินดีเจ้าyin-dii jâo · Isan ขอบใจkàwp-jai
• Very: Central มากmâak · Isan หลายlǎai

You'll notice the regions name their speech after the verb "to speak": Northerners อู้คำเมืองûu kam-mueang and Southerners แหลงใต้lǎeng dtâai. Some regional words have travelled: แซ่บsâep, from Isan food culture, is now used all over Thailand for food that's spicy and delicious.

If you live in Chiang Mai, you'll hear the Northern polite word เจ้าjâo at every market stall. In Isan, เด้อdôe softens sentences the way นะná does in standard Thai. Locals love it when a foreigner drops in one of these words, but everyone will understand your standard Thai.

Is Thai the same as Lao?

No, but they're very close relatives. Thai and Lao share most of their grammar and a large part of their everyday vocabulary, and Isan, the main language of northeast Thailand, is essentially Lao written in Thai script. Speakers in Laos generally understand Thai well, because Thai television, music and social media are everywhere there. Bangkok speakers understand Lao less easily, while people from Isan switch between the two all day.

The differences are real, though. Lao has its own script, a cousin of the Thai alphabet; tones and vowels differ; and common words change: ไม่mâi becomes บ่bàw (not), มากmâak becomes หลายlǎai (very), พูดpûut becomes เว้าwáo (speak). A curious result of history: with around 15 million Isan speakers, there are roughly twice as many people speaking Lao-type speech in Thailand as there are people in all of Laos (about 8 million).

How much English is spoken in Thailand?

Less than many visitors expect. In the EF English Proficiency Index 2025, Thailand ranked 116th of 123 countries, in the "very low proficiency" band. EF's index is based on people who chose to take its online test, so treat it as a rough signal, not a census. On the ground, it depends a lot on where you are:

• Bangkok: hotels, malls, international hospitals and many restaurants in Sukhumvit and Silom work in English. BTS and MRT signs and announcements are in Thai and English. Street vendors, taxi drivers and older people often speak little English.
• Phuket, Samui, Pattaya and the islands: English is the working language of the tourist trade.
• Chiang Mai: fine in the Old City and the Nimman cafés; markets, songthaew drivers and anything outside the centre need more Thai.
• Villages and small towns, especially in Isan: very little English.

Apps fill many gaps: ride-hailing apps take your destination in writing, and a camera translator handles menus. But even ten words of Thai change how people treat you. You go from a customer who needs looking after to a guest who's making an effort, and Thais respond to that warmly.

One shortcut: everyday Thai is full of English loanwords, said the Thai way. Ask for the ไวไฟwai-fai password, switch on the แอร์ae (air-con), call a แท็กซี่táek-sîi and finish dinner with เช็คบิลchék-bin (the bill, please). Listen for them: Thai sounds replace English ones, final sounds get clipped, and the words pick up tones.

Which Thai should you learn?

Standard Central Thai, almost always. It's understood everywhere, it's what you'll see written on every sign, and Thais from every region switch to it with outsiders. Every course, book and app teaches it. Add regional words later, for fun or for family: if your partner's family is from Isan or the North, learn standard Thai first and then the words you hear at home. Our lessons label the Northern and Isan words you're likely to meet.

The 10 Thai words that help most

1. สวัสดีsà-wàt-dii: hello (and goodbye)
2. ขอบคุณkàwp-kun: thank you
3. ขอโทษkǎw-tôot: sorry, excuse me
4. ไม่เป็นไรmâi bpen rai: no problem, never mind
5. ใช่châi: yes, that's right
6. ไม่mâi: no, not
7. เท่าไหร่tâo-rài: how much?
8. อร่อยà-ràwy: delicious
9. ห้องน้ำhâwng-náam: bathroom
10. ไม่เผ็ดmâi pèt: not spicy

Men add ครับkráp and women add ค่ะkâ to the polite ones, such as ขอบคุณครับkàwp-kun kráp. Our guide to krap and ka explains why. You can hear all ten below, and the first stage of our free course teaches every one of them.

Thai script in 60 seconds

Thai has its own alphabet, which grew out of the Old Khmer script in the 13th century. It has 44 consonants (two no longer used), vowels written above, below, before or after the consonant, and four tone marks. Words run together without spaces; a space marks the end of a phrase or sentence. There are no capital letters. Isan and Southern Thai are written in the same script, Northern Thai also has its traditional Lanna script, and Patani Malay is traditionally written in Jawi, an Arabic-based script. It looks daunting, but it's a regular system that you can learn in weeks: the free Read Thai course starts with seven easy letters and four vowels, enough to read your first words.