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.

Central Tai languages (6)

• Southern Zhuang (China)
  E (China)
  Man Cao Lan (Vietnam)
  Nung (Vietnam)
  Tày (Tho) (Vietnam)
  Ts'ün-Lao (Vietnam)
  East Central Tai languages (1)
  
  
  
  • Northwest Tai languages (1)
    
    
    
    • Turung (India)
      Northern Tai languages (4)
      
      
      
      • Northern Zhuang (China)
        Nhang (Vietnam)
        Bouyei (Buyi) (China)
        Tai Mène (Laos)
        Southwestern Tai languages (32)
        
        
        
        • Tai Ya (China)
          East Central Tai languages (10)
          
          
          
          • Chiang Saeng languages (8)
            
            
            
            • Tai Dam (Vietnam)
              Northern Thai (Lanna, Thai Yuan) (Thailand, Laos)
              Phuan (Thailand)
              Thai Song (Thailand)
              Thai (Thailand)
              Tai Hang Tong (Vietnam)
              Tai Dón (Vietnam)
              Tai Daeng (Vietnam)
              Tay Tac (Vietnam)
              Thu Lao (Vietnam)
              Lao-Phutai languages (4)
              
              
              
              • Lao (Laos)
                Nyaw (Thailand)
                Phu Thai (Thailand)
                Isan (Northeastern Thai) (Thailand, Laos)
                Northwestern Tai languages (9)
                
                
                
                • Ahom (India - extinct. Modern Assamese is Indo-European.)
                  Aiton (India)
                  Lü (Lue, Tai Lue) (China, Vietnam, Thailand, Laos, Myanmar)
                  Khamti (India, Myanmar)
                  Khün (Myanmar)
                  Khamyang (India)
                  Phake (India)
                  Shan (Myanmar)
                  Tai Nüa (China, Vietnam, Thailand, Laos)
                  Pu Ko (Laos)
                  Pa Di (China)
                  Southern Tai languages (1)
                  
                  
                  
                  • Southern Thai (Pak Thai) (Thailand)
                    Tai Thanh (Vietnam)
                    Tày Sa Pa (Vietnam)
                    Tai Long (Laos)
                    
                    
                    
                    • Tai Hongjin (China)
                      Yong (Thailand)
                      Unclassified Southwestern
                      
                      
                      
                      • Tai Hongjin (China)
                        Yong (Thailand)
                        Unclassified (1)
                        
                        
                        
                        • Kuan (Laos)
                          Rien (Laos)
                          Tay Khang (Laos)
                          Tai Pao (Laos)
                          Tai Do (Vietnam)