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An endangered language is a language that is at a risk of falling out of use, generally because it has few surviving speakers. If it loses all of its native speakers, it becomes an extinct language. UNESCO defines four levels of language endangerment between "safe" (not endangered) and "extinct":
Vulnerable Definitely endangered Severely endangered Critically endangered
| Language | Status | Comments | ISO 639-3 | Speakers |
| A'tong language | Severely endangered | aot | (undated figure of 10,000, 4,600 in India) | |
| Adi language | Vulnerable | Also spoken in: China | adi | 150,000 total for the various languages (2011 census) |
| Aimol language | Critically endangered | aim | 6,000 (2001 census) | |
| Aiton language | Severely endangered | aio | 1,500 (2006) | |
| Anal language | Vulnerable | anm | 120,000 (2011 census) | |
| Angami language | Vulnerable | njm | 150,000 (2011 census) | |
| Angika language | Vulnerable | Also spoken in: Nepal | anp | (740,000 cited 1997–2011) |
| Ao language | Vulnerable | ngo | 227,000 speakers(2011 census) | |
| Apatani language | Vulnerable | apt | ||
| Asur language | Definitely endangered | asr | ||
| Badaga language | Definitely endangered | bfq | ||
| Baghati language | Critically endangered | bfz | ||
| Balti language | Vulnerable | Also spoken in: Pakistan | bft | |
| Bangani language | Critically endangered | gbm | ||
| Bangni language | Vulnerable | |||
| Bawm language | Definitely endangered | Also spoken in: Bangladesh | bgr | |
| Bellari language | Critically endangered | brw | ||
| Bhadravahi language | Definitely endangered | Also spoken in: Pakistan | bhd | |
| Bhalesi language | Definitely endangered | bhd | ||
| Bharmauri language | Definitely endangered | gbk | ||
| Bhumij language | Vulnerable | bhu | ||
| Halbi language | Vulnerable | bij | ||
| Biete language | Definitely endangered | biu | ||
| Birhor language | Critically endangered | biy | ||
| Bishnupriya Manipuri language | Vulnerable | Also spoken in: Bangladesh | bpy | |
| Bodo language | Vulnerable | brx | ||
| Bokar language | Vulnerable | Also spoken in: China | adi | |
| Bori language | Definitely endangered | Also spoken in: China | adi | |
| Brokskat language | Definitely endangered | bkk | ||
| Bunan language | Definitely endangered | bfu | ||
| Byangsi language | Definitely endangered | Also spoken in: Nepal | bee | |
| Chambeali language | Definitely endangered | cdh | ||
| Chang language | Vulnerable | nbc | ||
| Chokri language | Vulnerable | nri | ||
| Churahi language | Definitely endangered | cdj | ||
| Dakpa language | Definitely endangered | Also spoken in: Bhutan | dka | |
| Darma language | Definitely endangered | Also spoken in: Nepal | drd | |
| Deori language | Definitely endangered | der | ||
| Dimasa language | Vulnerable | dis | ||
| Gadaba language | Critically endangered | gdb, gau | ||
| Galo language | Vulnerable | adl | ||
| Gangte language | Definitely endangered | gnb | ||
| Garhwali language | Vulnerable | gbm | ||
| Geta? language | Severely endangered | gaq | ||
| Gondi language | Vulnerable | gon | ||
| Gorum language | Definitely endangered | pcj | ||
| Gutob language | Vulnerable | gbj | ||
| Handuri language | Critically endangered | hii | ||
| Hill Miri language | Definitely endangered | mrg |