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The ISO 639 standard defines two-letter codes for many languages, and
three-letter codes for more rarely used languages.
All abbreviations for languages used in the Translation Project should
come from this standard.
For the commonly used languages, the ISO 639-1 standard defines two-letter
codes.
- ‘aa’
- 
Afar.
- ‘ab’
- 
Abkhazian.
- ‘ad’
- 
Adangme.
- ‘ae’
- 
Avestan.
- ‘af’
- 
Afrikaans.
- ‘ak’
- 
Akan.
- ‘am’
- 
Amharic.
- ‘an’
- 
Aragonese.
- ‘ar’
- 
Arabic.
- ‘as’
- 
Assamese.
- ‘av’
- 
Avaric.
- ‘ay’
- 
Aymara.
- ‘az’
- 
Azerbaijani.
- ‘ba’
- 
Bashkir.
- ‘be’
- 
Byelorussian; Belarusian.
- ‘bg’
- 
Bulgarian.
- ‘bh’
- 
Bihari.
- ‘bi’
- 
Bislama.
- ‘bm’
- 
Bambara.
- ‘bn’
- 
Bengali; Bangla.
- ‘bo’
- 
Tibetan.
- ‘br’
- 
Breton.
- ‘bs’
- 
Bosnian.
- ‘ca’
- 
Catalan.
- ‘ce’
- 
Chechen.
- ‘ch’
- 
Chamorro.
- ‘co’
- 
Corsican.
- ‘cr’
- 
Cree.
- ‘cs’
- 
Czech.
- ‘cu’
- 
Church Slavic.
- ‘cv’
- 
Chuvash.
- ‘cy’
- 
Welsh.
- ‘da’
- 
Danish.
- ‘de’
- 
German.
- ‘dv’
- 
Divehi; Maldivian.
- ‘dz’
- 
Dzongkha; Bhutani.
- ‘ee’
- 
'Ew'e.
- ‘el’
- 
Greek.
- ‘en’
- 
English.
- ‘eo’
- 
Esperanto.
- ‘es’
- 
Spanish.
- ‘et’
- 
Estonian.
- ‘eu’
- 
Basque.
- ‘fa’
- 
Persian.
- ‘ff’
- 
Fulah.
- ‘fi’
- 
Finnish.
- ‘fj’
- 
Fijian; Fiji.
- ‘fo’
- 
Faroese.
- ‘fr’
- 
French.
- ‘fy’
- 
Western Frisian.
- ‘ga’
- 
Irish.
- ‘gd’
- 
Scots; Gaelic.
- ‘gl’
- 
Galician.
- ‘gn’
- 
Guarani.
- ‘gu’
- 
Gujarati.
- ‘gv’
- 
Manx.
- ‘ha’
- 
Hausa.
- ‘he’
- 
Hebrew (formerly iw).
- ‘hi’
- 
Hindi.
- ‘ho’
- 
Hiri Motu.
- ‘hr’
- 
Croatian.
- ‘ht’
- 
Haitian; Haitian Creole.
- ‘hu’
- 
Hungarian.
- ‘hy’
- 
Armenian.
- ‘hz’
- 
Herero.
- ‘ia’
- 
Interlingua.
- ‘id’
- 
Indonesian (formerly in).
- ‘ie’
- 
Interlingue.
- ‘ig’
- 
Igbo.
- ‘ii’
- 
Sichuan Yi.
- ‘ik’
- 
Inupiak; Inupiaq.
- ‘io’
- 
Ido.
- ‘is’
- 
Icelandic.
- ‘it’
- 
Italian.
- ‘iu’
- 
Inuktitut.
- ‘ja’
- 
Japanese.
- ‘jv’
- 
Javanese.
- ‘ka’
- 
Georgian.
- ‘kg’
- 
Kongo.
- ‘ki’
- 
Kikuyu; Gikuyu.
- ‘kj’
- 
Kuanyama; Kwanyama.
- ‘kk’
- 
Kazakh.
- ‘kl’
- 
Kalaallisut; Greenlandic.
- ‘km’
- 
Khmer; Cambodian.
- ‘kn’
- 
Kannada.
- ‘ko’
- 
Korean.
- ‘kr’
- 
Kanuri.
- ‘ks’
- 
Kashmiri.
- ‘ku’
- 
Kurdish.
- ‘kv’
- 
Komi.
- ‘kw’
- 
Cornish.
- ‘ky’
- 
Kirghiz.
- ‘la’
- 
Latin.
- ‘lb’
- 
Letzeburgesch; Luxembourgish.
- ‘lg’
- 
Ganda.
- ‘li’
- 
Limburgish; Limburger; Limburgan.
- ‘ln’
- 
Lingala.
- ‘lo’
- 
Lao; Laotian.
- ‘lt’
- 
Lithuanian.
- ‘lu’
- 
Luba-Katanga.
- ‘lv’
- 
Latvian; Lettish.
- ‘mg’
- 
Malagasy.
- ‘mh’
- 
Marshallese.
- ‘mi’
- 
Maori.
- ‘mk’
- 
Macedonian.
- ‘ml’
- 
Malayalam.
- ‘mn’
- 
Mongolian.
- ‘mo’
- 
Moldavian.
- ‘mr’
- 
Marathi.
- ‘ms’
- 
Malay.
- ‘mt’
- 
Maltese.
- ‘my’
- 
Burmese.
- ‘na’
- 
Nauru.
- ‘nb’
- 
Norwegian Bokmål.
- ‘nd’
- 
Ndebele, North.
- ‘ne’
- 
Nepali.
- ‘ng’
- 
Ndonga.
- ‘nl’
- 
Dutch.
- ‘nn’
- 
Norwegian Nynorsk.
- ‘no’
- 
Norwegian.
- ‘nr’
- 
Ndebele, South.
- ‘nv’
- 
Navajo; Navaho.
- ‘ny’
- 
Chichewa; Nyanja.
- ‘oc’
- 
Occitan; Provençal.
- ‘oj’
- 
Ojibwa.
- ‘om’
- 
(Afan) Oromo.
- ‘or’
- 
Oriya.
- ‘os’
- 
Ossetian; Ossetic.
- ‘pa’
- 
Panjabi; Punjabi.
- ‘pi’
- 
Pali.
- ‘pl’
- 
Polish.
- ‘ps’
- 
Pashto, Pushto.
- ‘pt’
- 
Portuguese.
- ‘qu’
- 
Quechua.
- ‘rm’
- 
Rhaeto-Romance.
- ‘rn’
- 
Rundi; Kirundi.
- ‘ro’
- 
Romanian.
- ‘ru’
- 
Russian.
- ‘rw’
- 
Kinyarwanda.
- ‘sa’
- 
Sanskrit.
- ‘sc’
- 
Sardinian.
- ‘sd’
- 
Sindhi.
- ‘se’
- 
Northern Sami.
- ‘sg’
- 
Sango; Sangro.
- ‘si’
- 
Sinhala; Sinhalese.
- ‘sk’
- 
Slovak.
- ‘sl’
- 
Slovenian.
- ‘sm’
- 
Samoan.
- ‘sn’
- 
Shona.
- ‘so’
- 
Somali.
- ‘sq’
- 
Albanian.
- ‘sr’
- 
Serbian.
- ‘ss’
- 
Swati; Siswati.
- ‘st’
- 
Sesotho; Sotho, Southern.
- ‘su’
- 
Sundanese.
- ‘sv’
- 
Swedish.
- ‘sw’
- 
Swahili.
- ‘ta’
- 
Tamil.
- ‘te’
- 
Telugu.
- ‘tg’
- 
Tajik.
- ‘th’
- 
Thai.
- ‘ti’
- 
Tigrinya.
- ‘tk’
- 
Turkmen.
- ‘tl’
- 
Tagalog.
- ‘tn’
- 
Tswana; Setswana.
- ‘to’
- 
Tonga.
- ‘tr’
- 
Turkish.
- ‘ts’
- 
Tsonga.
- ‘tt’
- 
Tatar.
- ‘tw’
- 
Twi.
- ‘ty’
- 
Tahitian.
- ‘ug’
- 
Uighur.
- ‘uk’
- 
Ukrainian.
- ‘ur’
- 
Urdu.
- ‘uz’
- 
Uzbek.
- ‘ve’
- 
Venda.
- ‘vi’
- 
Vietnamese.
- ‘vo’
- 
Volapük; Volapuk.
- ‘wa’
- 
Walloon.
- ‘wo’
- 
Wolof.
- ‘xh’
- 
Xhosa.
- ‘yi’
- 
Yiddish (formerly ji).
- ‘yo’
- 
Yoruba.
- ‘za’
- 
Zhuang.
- ‘zh’
- 
Chinese.
- ‘zu’
- 
Zulu.
For rarely used languages, the ISO 639-2 standard defines three-letter
codes.  Here is the current list, reduced to only living languages with at least
one million of speakers.
- ‘ace’
- 
Achinese.
- ‘awa’
- 
Awadhi.
- ‘bad’
- 
Banda.
- ‘bal’
- 
Baluchi.
- ‘ban’
- 
Balinese.
- ‘bem’
- 
Bemba.
- ‘bho’
- 
Bhojpuri.
- ‘bik’
- 
Bikol.
- ‘bin’
- 
Bini.
- ‘btk’
- 
Batak (Indonesia).
- ‘bug’
- 
Buginese.
- ‘ceb’
- 
Cebuano.
- ‘din’
- 
Dinka.
- ‘doi’
- 
Dogri.
- ‘fil’
- 
Filipino; Pilipino.
- ‘fon’
- 
Fon.
- ‘gon’
- 
Gondi.
- ‘gsw’
- 
Alemani; Swiss German.
- ‘hil’
- 
Hiligaynon.
- ‘hmn’
- 
Hmong.
- ‘ilo’
- 
Iloko.
- ‘kab’
- 
Kabyle.
- ‘kam’
- 
Kamba.
- ‘kbd’
- 
Kabardian.
- ‘kmb’
- 
Kimbundu.
- ‘kok’
- 
Konkani.
- ‘kru’
- 
Kurukh.
- ‘lua’
- 
Luba-Lulua.
- ‘luo’
- 
Luo (Kenya and Tanzania).
- ‘mad’
- 
Madurese.
- ‘mag’
- 
Magahi.
- ‘mai’
- 
Maithili.
- ‘mak’
- 
Makasar.
- ‘man’
- 
Mandingo.
- ‘men’
- 
Mende.
- ‘min’
- 
Minangkabau.
- ‘mni’
- 
Manipuri.
- ‘mos’
- 
Mossi.
- ‘mwr’
- 
Marwari.
- ‘nap’
- 
Neapolitan.
- ‘nso’
- 
Pedi; Sepedi; Northern Sotho.
- ‘nym’
- 
Nyamwezi.
- ‘nyn’
- 
Nyankole.
- ‘pag’
- 
Pangasinan.
- ‘pam’
- 
Pampanga.
- ‘raj’
- 
Rajasthani.
- ‘sas’
- 
Sasak.
- ‘sat’
- 
Santali.
- ‘scn’
- 
Sicilian.
- ‘shn’
- 
Shan.
- ‘sid’
- 
Sidamo.
- ‘srr’
- 
Serer.
- ‘suk’
- 
Sukuma.
- ‘sus’
- 
Susu.
- ‘tem’
- 
Timne.
- ‘tiv’
- 
Tiv.
- ‘tum’
- 
Tumbuka.
- ‘umb’
- 
Umbundu.
- ‘wal’
- 
Walamo.
- ‘war’
- 
Waray.
- ‘yao’
- 
Yao.
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