- Language: Tongan
- Alternate names: TONGA
- Language code: ton
- Language family: Austronesian, Malayo-Polynesian, Central-Eastern, Eastern Malayo-Polynesian, Oceanic, Central-Eastern Oceanic, Remote Oceanic, Central Pacific, East Fijian-Polynesian, Polynesian, Tongic
- Number of speakers:
Closely related to Niue. There are slight dialect differences from north to south. 86% lexical similarity with Wallisian, 66% with Samoan. The ethnic group is predominantly monolingual in Tongan (1997 J. Siegel). National language. Dictionary. VSO. Newspapers, radio programs. Agriculturalists. Bible 1862-1966.