Gongduk or Gongdu (Tibetan: དགོང་འདུས་, Wylie: Dgong-'dus, it is also known as Gongdubikha[2]) is an endangered Sino-Tibetan language spoken by about 1,000 people in a few inaccessible villages located near the Kuri Chhu river in the Gongdue Gewog of Mongar District in eastern Bhutan.

The names of the villages are Bala, Dagsa, Damkhar, Pam, Pangthang, and Yangbari (Ethnologue).

[5] Gongduk has complex verbal morphology, which Ethnologue considers a retention from Proto-Tibeto-Burman,[1] and is lexically highly divergent.

[citation needed] Gerber (2018)[8] notes that Gongduk has had extensive contact with Black Mountain Mönpa before the arrival of East Bodish languages in Bhutan.

[10] Examples: van Driem (2014) compares the Gongduk first person singular personal pronoun ðə 'I, me' to Kathmandu Newar dʑiː ~ dʑĩ- 'I, me' and Tshangla dʑaŋ ~ dʑi- ~ dʑiŋ- 'I, me'.