Dubious languages are those whose existence is uncertain. They include:
The list includes codes that have been retired from ISO 639-3 or languages removed from Ethnologue because the language apparently does not exist and cannot be identified with an existing language. The list does not include instances where the "language" turns out to be a spelling variant of another language or the name of a village where an already known language is spoken; these are cases of duplicates, which are resolved in ISO 639-3 by a code merger. It does include "languages" for which there is no evidence or which cannot be found. (In some cases, however, the evidence for nonexistence is a survey among the current population of the area, which would not identify extinct languages such as Ware below.)
SIL codes are upper case; ISO codes are lower case. Once retired, ISO 639-3 codes are not reused. SIL codes that were retired prior to 2006 may have been re-used or may have reappeared as ISO codes for other languages.
Additional languages and codes were retired in 2016, due to a lack of evidence that they existed, but were not necessarily spurious as languages.
Campbell, Lyle (2012). "Classification of the indigenous languages of South America". In Grondona, Verónica; Campbell, Lyle (eds.). The Indigenous Languages of South America. The World of Linguistics. Vol. 2. Berlin: De Gruyter Mouton. pp. 59–166. ISBN 9783110255133. 9783110255133
Upper Kaeme may correspond to Korowai. /wiki/Korowai_language
Tapeba at Ethnologue (17th ed., 2013)
https://www.ethnologue.com/17/language/tbb/
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Tapeba". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History. http://glottolog.org/resource/languoid/id/tape1236
"Glottolog 2.4 – Adabe". Glottolog.org. Retrieved 13 July 2015. http://glottolog.org/resource/reference/id/321418
"ISO 639-3 Change History". 01.sil.org. Retrieved 13 July 2015. http://www-01.sil.org/iso639-3/changes.asp
Sidwell, 2009, Classifying the Austroasiatic languages
"Ethnologue 14 report for language code:JIJ". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=JIJ
"Ethnologue 14 report for language code:CKN". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=CKN
"Ethnologue 14 report for language code:LWD". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=LWD
"Ethnologue 14 report for language code:ORB". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=ORB
"Ethnologue 14 report for language code:MUF". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=MUF
"Ethnologue 14 report for language code:NCQ". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=NCQ
"Ethnologue 14 report for language code:NKQ". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=NKQ
"Ethnologue 14 report for language code:OSO". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=OSO
"Ethnologue 14 report for language code:RUR". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=RUR
"Ethnologue 14 report for language code:WBD". Ethnologue.com. Retrieved 24 September 2012. http://www.ethnologue.com/14/show_language.asp?code=WBD
Hurd, Conrad (8 August 2006). "Request Number 2006-016 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2006/2006-016.pdf
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Miarra". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History. http://glottolog.org/resource/languoid/id/miar1236
Hurd, Conrad (26 March 2007). "Request Number 2006-122 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2006/2006-122.pdf
Hurd, Conrad (21 March 2007). "Request Number 2006-124 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2006/2006-124.pdf
Holbrook, David J. (5 April 2007). "Request Number 2007-003 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2007/2007-003.pdf
Peebles, Matt (1 September 2007). "Request Number 2007-254 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2007/2007-254.pdf
Woodward, Mark (23 May 2007). "Request Number 2007-024 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2007/2007-024.pdf
Hurd, Conrad (8 August 2006). "Request Number 2006-016 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2006/2006-016.pdf
McLaughlin, John (3 March 2008). "Request Number 2008-030 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 12 July 2023. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2008/2008-030.pdf
Legère, Karsten (18 August 2011). "Request Number 2011-133 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2011/2011-133.pdf
Bickford, J. Albert (31 January 2014). "Request Number 2014-010 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2014/2014-010.pdf
"Request Number 2014-032 for Change to ISO 639-3 Language Code" (PDF). SIL International. 25 July 2014. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2014/2014-032.pdf
"639 Identifier Documentation: dzd". SIL International. Retrieved 13 February 2023. https://iso639-3.sil.org/code/dzd
"639 Identifier Documentation: xsj". SIL International. Retrieved 26 January 2019. https://iso639-3.sil.org/code/xsj
Dyer, Josh (28 August 2014). "Request Number 2014-059 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2014/2014-059.pdf
"Request Number 2015-011 for Change to ISO 639-3 Language Code" (PDF). SIL International. 9 March 2015. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2015/2015-011.pdf
"2015-022 | ISO 639-3". iso639-3.sil.org. Archived from the original on 29 January 2022. Retrieved 14 March 2025. http://web.archive.org/web/20220129065601/https://iso639-3.sil.org/request/2015-022
"Request Number 2015-032 for Change to ISO 639-3 Language Code" (PDF). SIL International. 28 May 2015. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2015/2015-032.pdf
Cheeseman, Nate (16 February 2016). "Request Number 2016-010 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2016/2016-010.pdf
Bickford, Albert (23 September 2015). "Request Number 2016-002 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2016/2016-002.pdf
Cheeseman, Nate (27 October 2015). "Request Number 2016-005 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2016/2016-005.pdf
"Request Number 2016-004 for Change to ISO 639-3 Language Code" (PDF). SIL International. 26 October 2015. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2016/2016-004.pdf
Bickford, J. Albert (9 March 2017). "Request Number 2017-013 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2017/2017-013.pdf
Legère, Karsten (18 May 2017). "Request Number 2017-017 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2017/2017-017.pdf
Legère, Karsten (31 August 2016). "Request Number 2016-029 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 6 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2016/2016-029.pdf
"Request Number 2018-016 for Change to ISO 639-3 Language Code" (PDF). SIL International. 20 August 2018. Retrieved 15 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2018/2018-016.pdf
Gehrmann, Ryan (22 January 2018). "Request Number 2018-008 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 25 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2018/2018-008.pdf
"Request Number 2018-011 for Change to ISO 639-3 Language Code" (PDF). SIL International. 9 August 2018. Retrieved 25 January 2019. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2018/2018-011.pdf
"Request Number 2019-017 for Change to ISO 639-3 Language Code" (PDF). SIL International. 1 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-017.pdf
"Request Number 2019-018 for Change to ISO 639-3 Language Code" (PDF). SIL International. 4 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-018.pdf
"Request Number 2019-013 for Change to ISO 639-3 Language Code" (PDF). SIL International. 5 January 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-013.pdf
"Request Number 2019-019 for Change to ISO 639-3 Language Code" (PDF). SIL International. 4 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-019.pdf
"Request Number 2019-020 for Change to ISO 639-3 Language Code" (PDF). SIL International. 5 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-020.pdf
"Request Number 2019-028 for Change to ISO 639-3 Language Code" (PDF). SIL International. 14 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-028.pdf
"Request Number 2019-029 for Change to ISO 639-3 Language Code" (PDF). SIL International. 18 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-029.pdf
"Request Number 2019-015 for Change to ISO 639-3 Language Code" (PDF). SIL International. 16 February 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-015.pdf
"Request Number 2019-026 for Change to ISO 639-3 Language Code" (PDF). SIL International. 12 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-026.pdf
"Request Number 2019-025 for Change to ISO 639-3 Language Code" (PDF). SIL International. 7 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-025.pdf
"Request Number 2019-034 for Change to ISO 639-3 Language Code" (PDF). SIL International. 13 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-034.pdf
"Request Number 2019-032 for Change to ISO 639-3 Language Code" (PDF). SIL International. 13 March 2019. Retrieved 5 February 2020. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2019/2019-032.pdf
"2020-026 | Iso 639-3". https://iso639-3.sil.org/request/2020-026
"Request Number 2021-015 for Change to ISO 639-3 Language Code" (PDF). SIL International. 25 February 2021. Retrieved 4 February 2022. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2021/2021-015.pdf
"Request Number 2021-021 for Change to ISO 639-3 Language Code" (PDF). SIL International. 26 April 2021. Retrieved 4 February 2022. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2021/2021-021.pdf
Turki, Houcemeddine (21 April 2021). "Request Number 2021-020 for Change to ISO 639-3 Language Code" (PDF). SIL International. Retrieved 12 July 2023. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2021/2021-020.pdf
"Request Number 2022-012 for Change to ISO 639-3 Language Code" (PDF). SIL International. 30 June 2022. Retrieved 8 February 2023. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2022/2022-012.pdf
"Request Number 2022-012 for Change to ISO 639-3 Language Code" (PDF). SIL International. 30 June 2022. Retrieved 8 February 2023. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2022/2022-011.pdf
"Request Number 2022-011 for Change to ISO 639-3 Language Code" (PDF). SIL International. 30 June 2022. Retrieved 8 February 2023. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2022/2022-011.pdf
"Request Number 2022-015 for Change to ISO 639-3 Language Code" (PDF). SIL International. 30 June 2022. Retrieved 8 February 2023. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2022/2022-015.pdf
"Request Number 2022-009 for Change to ISO 639-3 Language Code" (PDF). SIL International. 24 June 2022. Retrieved 8 February 2023. https://iso639-3.sil.org/sites/iso639-3/files/change_requests/2022/2022-009.pdf