The Tai languages are a subgroup of the Tai Kadai language family. The Tai languages include the most widely spoken of the Tai-Kadai languages, including Thai, the national language of Thailand, Lao or Laotian, the national language of Laos, Myanmar's Shan language, and Zhuang, a major language of southern China.

Disambiguation Note: TAI is also an abbreviation for International Atomic Time (letter order within the acronym based the French name Temps Atomique International).

Tai languages

• Central Tai languages (6)
  • Zhuang language (China)
  • E language (China)
  • Man Cao Lan language (Vietnam)
  • Nung language (Vietnam)
  • Tày language (Vietnam)
  • Ts'ün-Lao language (Vietnam)
• Northwestern Tai languages (1)
  • Turung language (India)
• Northern Tai languages (4)
  • Northern Zhuang language (China)
  • Nhang language (Vietnam)
  • Bouyei language (Buyi) (China)
  • Tai Mène language (Laos)
• Southwestern Tai languages (29)
  • Pu Ko language (Laos)
  • Tai Long language (Laos)
  • East Central Tai languages (21)
    • Chiang Saeng languages (8)
      • Tai Dam language (Vietnam)
      • Northern Thai language (Lanna, Thai Yuan) (Thailand, Laos)
      • Phuan language (Thailand)
      • Song language (Thailand)
      • Thai language (Thailand)
      • Tai Dón language (Vietnam)
      • Tai Daeng language (Vietnam)
      • Tay Tac language (Vietnam)
    • Lao-Phutai languages (4)
      • Lao language (Laos)
      • Nyaw language (Thailand)
      • Phu Thai language (Thailand)
      • Isan language (Northeastern Thai) (Thailand, Laos)
    • Northwestern Tai languages (9)
      • Ahom language (India - extinct. Modern Assamese is Indo-European.)
      • Aiton language (India)
      • Lü language (Lue, Tai Lue) (China, Vietnam, Thailand, Laos, Myanmar)
      • Khamti language (India, Myanmar)
      • Khün language (Myanmar)
      • Khamyang language (India)
      • Phake language (India)
      • Shan language (Myanmar)
      • Tai Nüa language (China, Vietnam, Thailand, Laos)
  • Southern Tai languages (1)
    • Southern Thai language (Pak Thai) (Thailand)
  • Unclassified Southwestern Tai languages (5)
    • Tai Ya language (China)
    • Tai Hang Tong language (Vietnam)
    • Tai Hongjin language (China)
    • Tai Man Thanh language (Vietnam)
    • Yong language (Thailand)
• Unclassified Tai languages (7)
  • Kang language (Laos)
  • Rien language (Laos)
  • Tay Khang language (Laos)
  • Tai Pao language (Laos)
  • Tay Jo language (Vietnam)
  • Kuan language (Laos)
  • Yoy language (Thailand)