From the ISO official website there are two items for ISO 639:
In other words, there are two-letter codes and three-letter codes (sorted by language name in the third column!). For 22 languages exist two 3-letter-codes. The first is bibliographic (ISO 639-1/B) the second for terminological (ISO 639-2/T) use.
See also: language families and languages, list of languages, list of official languages
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abk ab Abkhazian ace Achinese ach Acoli ada Adangme ady Adyghe; Adygei aar aa Afar afh Afrihili afr af Afrikaans afa Afro-Asiatic (Other) aka Akan akk Akkadian alb/sqi sq Albanian ale Aleut alg Algonquian languages tut Altaic (Other) amh am Amharic apa Apache languages ara ar Arabic arc Aramaic arg an Aragonese arn Araucanian arp Arapaho arw Arawak arm/hye hy Armenian art Artifical (Other) asm as Assamese ast Asturian ath Athapascan languages map Austronesian (Other) ava Avaric ave Avestan awa Awadhi aym ay Aymara aze az Azerbaijani nah Aztec
ban Balinese bat Baltic (Other) bal Baluchi bam Bambara bai Bamileke languages bad Banda bnt Bantu (Other) bas Basa bak ba Bashkir baq/eus eu Basque bej Beja bem Bemba ben bn Bengali ber Berber (Other) bho Bhojpuri bih bh Bihari bik Bikol bin Bini bis bi Bislama bra Braj bre be Breton bug Buginese bul bg Bulgarian bua Buriat bur/mya my Burmese bel be Byelorussian
cad Caddo car Carib cat ca Catalan cau Caucasian (Other) ceb Cebuano cel Celtic (Other) cai American Indian">Central American Indian (Other) chg Chagatai cha Chamorro che Chechen chr Cherokee chy Cheyenne chb Chibcha chi/zho zh Chinese chn Chinook jargon cho Choctaw chu Church Slavic chv Chuvash cop Coptic cor Cornish cos co Corsican cre Cree mus Creek crp Creoles and Pidgins (Other) cpe Creoles and Pidgins, English-based (Other) cpf Creoles and Pidgins, French-based (Other) cpp Creoles and Pidgins, Portuguese-based (Other) cus Cushitic (Other) crh Crimean Tatar scr hr Croatian cze/ces cs Czech
dak Dakota dan da Danish dar Dargwa del Delaware din Dinka div Divehi doi Dogri dra Dravidian (Other) dua Duala dut/nld nl Dutch dum Dutch, Middle (ca. 1050-1350) dyu Dyula dzo dz Dzongkha
efi Efik egy Egyptian (Ancient) eka Ekajuk elx Elamite eng en English enm English, Middle (ca. 1100-1500) ang English, Old (ca. 450-1100) myv Erzya esk Eskimo (Other) epo eo Esperanto est et Estonian ewe Ewe ewo Ewondo
fan Fang fat Fanti fao fo Faroese fij fj Fijian fin fi Finnish fiu Finno-Ugrian languages (Other) fon Fon fra/fre fr French frm French, Middle (ca. 1400-1600) fro French, Old (842- ca. 1400) fry fy Frisian ful Fulah
gaa Ga gla gd Gaelic (Scots) glg gl Gallegan lug lg Ganda gay Gayo gez Geez geo/kat ka Georgian ger/deu de German gmh German, Middle High (ca. 1050-1500) goh German, Old High (ca. 750 - 1050) gem Germanic languages (Other) gil Gilbertese gon Gondi got Gothic grb Grebo grc Greek, Ancient (to 1453) gre/ell el Greek, Modern (1453 -) kal kl Greenlandic grn gn Guarani guj gu Gujarati
hai Haida hat ht Haitian; Haitian Creole hau ha Hausa haw Hawaiian heb he Hebrew her hz Herero hil Hiligaynon him Himachali hin hi Hindi hmo ho Hiri Motu hun hu Hungarian hup Hupa
iba Iban ice/isl is Icelandic ido io Ido ibo ig Igbo ijo Ijo ilo Iloko inc Indic languages (Other) ine Indo-European languages (Other) ind id Indonesian inh Ingush ina ia Interlingua (International Auxiliary language Association) ine - Interlingue iku iu Inuktitut ipk ik Inupiak ira Iranian (Other) gle ga Irish sga Irish, Old (to 900) mga Irish, Middle (900 - 1200) iro Iroquoian languages ita it Italian
jpn ja Japanese jav jv Javanese jrb Judeo-Arabic jpr Judeo-Persian
kbd Kabardian kab Kabyle kac Kachin kal kl Kalaallisut; Greenlandic xal Kalmyk kam Kamba kan kn Kannada kau kr Kanuri kaa Kara-Kalpak krc Karachay-Balkar kar Karen kas ks Kashmiri csb Kashubian kaw Kawi kaz kk Kazakh kha Khasi khm km Khmer khi Khoisan (Other) kho Khotanese kik Kikuyu kin rw Kinyarwanda kir ky Kirghiz kom Komi kon kg Kongo kok Konkani kor ko Korean kpe Kpelle kro Kru kua kj Kuanyama kum Kumyk kur ku Kurdish kru Kurukh kus Kusaie kut Kutenai
lad Ladino lah Lahnda lam Lamba lao lo Lao lat la Latin lav lv Latvian ltz Letzeburgesch lez Lezghian lin ln Lingala lit lt Lithuanian log pd Low German loz Lozi lub Luba-Katanga lui Luiseno smj Lule Sami lun Lunda luo Luo (Kenya and Tanzania)
mac/mkd mk Macedonian (language´s status discussed) mad Madurese mag Magahi mai Maithili mak Makasar mlg mg Malagasy may/msa ms Malay mal Malayalam mlt mt Maltese man Mandingo mni Manipuri mno Manobo languages glv gv Manx mao/mri mi Maori mar mr Marathi chm Mari mah mh Marshall mwr Marwari mas Masai myn Mayan languages men Mende mic Micmac min Minangkabau mis Miscellaneous (Other) moh Mohawk mdf Moksha mol mo Moldavian mkh Mon-Kmer (Other) lol Mongo mon mn Mongolian mos Mossi mul Multiple languages (several languages used) mun Munda languages
nau na Nauru nav nv Navajo nde nd Ndebele, North nbl nr Ndebele, South ndo ng Ndongo nep ne Nepali new Newari nic Niger-Kordofanian languages (Other) ssa Nilo-Saharan languages (Other) niu Niuean nog Nogai non Norse, Old nai American Indian languages">North American Indian languages (Other) nor no Norwegian nbo nb Norwegian Bokmål nno nn Norwegian (Nynorsk) nub Nubian languages nym Nyamwezi nya ny Nyanja nyn Nyankole nyo Nyoro nzi Nzima
oci oc Occitan (post 1500); Provençal oji oj Ojibwa ori or Oriya orm om Oromo osa Osage oss os Ossetian oto Otomian languages
pal Pahlavi pau Palauan pli pi Pali pam Pampanga pag Pangasinan pan pa Panjabi pap Papiamento paa Papuan-Australian languages (Other) per/fas fa Persian peo Persian, Old (ca 600 - 400 B.C.) phn Phoenician pol pl Polish pon Ponape por pt Portuguese pra Prakrit languages pro Provencal, Old (to 1500) pus ps Pushto
que qu Quechua
roh rm Rhaeto-Romance raj Rajasthani rar Rarotongan roa Romance languages (Other) rum/ron ro Romanian rom Romany run rn Rundi rus ru Russian
sal Salishan languages sam Samaritan Aramaic smi Sami languages smo sm Samoan sad Sandawe sag sg Sango san sa Sanskrit srd Sardinian sco Scots sel Selkup sem Semitic languages (Other) scc/srp sr Serbian (sh) Serbo-Croatian srr Serer shn Shan sna sn Shona sid Sidamo bla Siksika snd sd Sindhi sin si Singhalese sit - Sino-Tibetan languages (Other) sio Siouan languages sla Slavic languages (Other) ssw ss Siswant (the same as Swati, see below) slk/slo sk Slovak slv sl Slovenian sog Sogdian som so Somali son Songhai wen Sorbian languages nso Northern Sotho language sot st Southern Sotho language sai American Indian languages">South American Indian languages (Other) spa es Spanish suk Sukuma sux Sumerian sun su Sundanese sus Susu swa sw Swahili ssw ss Swati/Swazi swe sv Swedish syr Syriac
tgl tl Tagalog tah Tahitian tgk tg Tajik tmh Tamashek tam ta Tamil tat tt Tatar tel te Telugu ter Tereno tha th Thai tib/bod bo Tibetan tig Tigre tir ti Tigrinya tem Timne tiv Tivi tli Tlingit tog Tonga (Nyasa) ton to Tonga (Tonga Islands) tru Truk tsi Tsimshian tso ts Tsonga tsn tn Tswana tum Tumbuka tur tr Turkish ota Turkish, Ottoman (1500 - 1928) tuk tk Turkmen tyv Tuvinian twi tw Twi
udm Udmurt uga Ugaritic uig ug Uighur ukr uk Ukrainian umb Umbundu und Undetermined (language or languages cannot be identified) urd ur Urdu uzb uz Uzbek
vai Vai ven Venda vie vi Vietnamese vol vo Volapük vot Votic
wak Wakashan languages wal Walamo wln wa Walloon war Waray was Washo
wel/cym cy Welsh wol wo Wolof
xho xh Xhosa
sah Yakut yao Yao yap Yap yid yi Yiddish yor yo Yoruba
zap Zapotec zen Zenaga zha za Zhuang zul zu Zulu zun Zuni