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There are two sets of alpha-3 language codes, one for terminological use (ISO 639-2/T) and one for bibliographic use (ISO 639-2/B).
The Registration Authority for ISO 639 is Library of Congress, Washington, D.C. 20540 USA (c/o Network development and MARC Standards Office).
After 5 years from the adoption of the standard (i.e. in 2001), the following code may be used as a terminological code:
| esp | Spanish |
| T | B | Language name (in English) | 639-1 |
| aar | aar | Afar | aa |
| abk | abk | Abkhazian | ab |
| ace | ace | Achinese | |
| ach | ach | Acoli | |
| ada | ada | Adangme | |
| afa | afa | Afro-Asiatic (Other) | |
| afh | afh | Afrihili | |
| afr | afr | Afrikaans | af |
| ajm | ajm | Aljamia | |
| aka | aka | Akan | |
| akk | akk | Akkadian | |
| ale | ale | Aleut | |
| alg | alg | Algonquian languages | |
| amh | amh | Amharic | am |
| ang | ang | English, Old (ca. 450-1100) | |
| apa | apa | Apache languages | |
| ara | ara | Arabic | ar |
| arc | arc | Aramaic | |
| arn | arn | Araucanian | |
| arp | arp | Arapaho | |
| art | art | Artificial (Other) | |
| arw | arw | Arawak | |
| asm | asm | Assamese | as |
| ath | ath | Athapascan languages | |
| aus | aus | Australian languages | |
| ava | ava | Avaric | |
| ave | ave | Avestan | |
| awa | awa | Awadhi | |
| aym | aym | Aymara | ay |
| aze | aze | Azerbaijani | az |
| bad | bad | Banda | |
| bai | bai | Bamileke languages | |
| bak | bak | Bashkir | ba |
| bal | bal | Baluchi | |
| bam | bam | Bambara | |
| ban | ban | Balinese | |
| bas | bas | Basa | |
| bat | bat | Baltic (Other) | |
| bej | bej | Beja | |
| bel | bel | Belarussian | be |
| bem | bem | Bemba | |
| ben | ben | Bengali | bn |
| ber | ber | Berber (Other) | |
| bho | bho | Bhojpuri | |
| bih | bih | Bihari | bh |
| bik | bik | Bikol | |
| bin | bin | Bini | |
| bis | bis | Bislama | bi |
| bla | bla | Siksika | |
| bnt | bnt | Bantu (Other) | |
| bod | tib | Tibetan | bo |
| bra | bra | Braj | |
| bre | bre | Breton | br |
| btk | btk | Batak (Indonesia) | |
| bua | bua | Buriat | |
| bug | bug | Buginese | |
| bul | bul | Bulgarian | bg |
| cad | cad | Caddo | |
| cai | cai | Central American Indian (Other) | |
| car | car | Carib | |
| cat | cat | Catalan | ca |
| cau | cau | Caucasian (Other) | |
| ceb | ceb | Cebuano | |
| cel | cel | Celtic (Other) | |
| ces | cze | Czech | cs |
| cha | cha | Chamorro | |
| chb | chb | Chibcha | |
| che | che | Chechen | |
| chg | chg | Chagatai | |
| chk | chk | Chuukese | |
| chm | chm | Mari | |
| chn | chn | Chinook jargon | |
| cho | cho | Choctaw | |
| chp | chp | Chipewyan | |
| chr | chr | Cherokee | |
| chu | chu | Church Slavic | |
| chv | chv | Chuvash | |
| chy | chy | Cheyenne | |
| cmc | cmc | Chamic languages | |
| cop | cop | Coptic | |
| cor | cor | Cornish | kw |
| cos | cos | Corsican | co |
| cpe | cpe | Creoles and pidgins, English-based (Other) | |
| cpf | cpf | Creoles and pidgins, French-based (Other) | |
| cpp | cpp | Creoles and pidgins, Portuguese-based (Other) | |
| cre | cre | Cree | |
| crp | crp | Creoles and pidgins (Other) | |
| cus | cus | Cushitic (Other) | |
| cym | wel | Welsh | cy |
| dak | dak | Dakota | |
| dan | dan | Danish | da |
| day | day | Dayak | |
| del | del | Delaware | |
| den | den | Slave (Athapascan) | |
| deu | ger | German | de |
| dgr | dgr | Dogrib | |
| din | din | Dinka | |
| div | div | Divehi | |
| doi | doi | Dogri | |
| dra | dra | Dravidian (Other) | |
| dua | dua | Duala | |
| dum | dum | Dutch, Middle (ca. 1050-1350) | |
| dyu | dyu | Dyula | |
| dzo | dzo | Dzongkha | dz |
| efi | efi | Efik | |
| egy | egy | Egyptian (Ancient) | |
| eka | eka | Ekajuk | |
| ell | gre | Greek, Modern (1453-) | el |
| elx | elx | Elamite | |
| eng | eng | English | en |
| enm | enm | English, Middle (1100-1500) | |
| epo | epo | Esperanto | eo |
| est | est | Estonian | et |
| eth | eth | Ethiopic | |
| eus | baq | Basque | eu |
| ewe | ewe | Ewe | |
| ewo | ewo | Ewondo | |
| fan | fan | Fang | |
| fao | fao | Faroese | fo |
| fas | per | Persian | fa |
| fat | fat | Fanti | |
| fij | fij | Fijian | fj |
| fin | fin | Finnish | fi |
| fiu | fiu | Finno-Ugrian (Other) | |
| fon | fon | Fon | |
| fra | fre | French | fr |
| frm | frm | French, Middle (ca. 1400-1600) | |
| fro | fro | French, Old (ca. 842-1400) | |
| fry | fry | Frisian | fy |
| ful | ful | Fulah | |
| fur | fur | Friulian | |
| gaa | gaa | Ga | |
| gai | iri | Irish | ga |
| gay | gay | Gayo | |
| gba | gba | Gbaya | |
| gdh | gae | Gaelic (Scots) | gd |
| gem | gem | Germanic (Other) | |
| gez | gez | Geez | |
| gil | gil | Gilbertese | |
| glg | glg | Gallegan | gl |
| gmh | gmh | German, Middle High (ca. 1050-1500) | |
| goh | goh | German, Old High (ca. 750-1050) | |
| gon | gon | Gondi | |
| gor | gor | Gorontalo | |
| got | got | Gothic | |
| grb | grb | Grebo | |
| grc | grc | Greek, Ancient (to 1453) | |
| grn | grn | Guarani | gn |
| guj | guj | Gujarati | gu |
| gwi | gwi | Gwich'in | |
| hai | hai | Haida | |
| hau | hau | Hausa | ha |
| haw | haw | Hawaiian | |
| heb | heb | Hebrew | he/iw |
| her | her | Herero | |
| hil | hil | Hiligaynon | |
| him | him | Himachali | |
| hin | hin | Hindi | hi |
| hit | hit | Hittite | |
| hmn | hmn | Hmong | |
| hmo | hmo | Hiri Motu | |
| hrv | scr | Croatian | hr |
| hun | hun | Hungarian | hu |
| hup | hup | Hupa | |
| hye | arm | Armenian | hy |
| iba | iba | Iban | |
| ibo | ibo | Igbo | |
| ijo | ijo | Ijo | |
| iku | iku | Inuktitut | iu |
| ile | ile | Interlingue | ie |
| ilo | ilo | Iloko | |
| ina | ina | Interlingua (International Auxilary Language Association) | ia |
| inc | inc | Indic (Other) | |
| ind | ind | Indonesian | id/in |
| ine | ine | Indo-European (Other) | |
| ipk | ipk | Inupiak | ik |
| ira | ira | Iranian (Other) | |
| iro | iro | Iroquoian languages | |
| isl | ice | Icelandic | is |
| ita | ita | Italian | it |
| jaw | jav | Javanese | jw |
| jpn | jpn | Japanese | ja |
| jpr | jpr | Judeo-Persian | |
| jrb | jrb | Judeo-Arabic | |
| kaa | kaa | Kara-Kalpak | |
| kab | kab | Kabyle | |
| kac | kac | Kachin | |
| kal | kal | Kalaallisut | kl |
| kam | kam | Kamba | |
| kan | kan | Kannada | kn |
| kar | kar | Karen | |
| kas | kas | Kashmiri | ks |
| kat | geo | Georgian | ka |
| kau | kau | Kanuri | |
| kaw | kaw | Kawi | |
| kaz | kaz | Kazakh | kk |
| kha | kha | Khasi | |
| khi | khi | Khoisan (Other) | |
| khm | khm | Khmer | km |
| kho | kho | Khotanese | |
| kik | kik | Kikuyu | |
| kin | kin | Kinyarwanda | rw |
| kir | kir | Kirghiz | ky |
| kmb | kmb | Kimbundu | |
| kok | kok | Konkani | |
| kom | kom | Komi | |
| kon | kon | Kongo | |
| kor | kor | Korean | ko |
| kos | kos | Kosraean | |
| kpe | kpe | Kpelle | |
| kro | kro | Kru | |
| kru | kru | Kurukh | |
| kua | kua | Kuanyama | |
| kum | kum | Kumyk | |
| kur | kur | Kurdish | ku |
| kut | kut | Kutenai | |
| lad | lad | Ladino | |
| lah | lah | Lahnda | |
| lam | lam | Lamba | |
| lao | lao | Lao | lo |
| lat | lat | Latin | la |
| lav | lav | Latvian | lv |
| lez | lez | Lezghian | |
| lin | lin | Lingala | ln |
| lit | lit | Lithuanian | lt |
| lol | lol | Mongo | |
| loz | loz | Lozi | |
| ltz | ltz | Lëtzeburgesch | lb |
| lua | lua | Luba-Lulua | |
| lub | lub | Luba-Katanga | |
| lug | lug | Ganda | |
| lui | lui | Luiseno | |
| lun | lun | Lunda | |
| luo | luo | Luo (Kenya and Tanzania) | |
| lus | lus | Lushai | |
| mad | mad | Madurese | |
| mag | mag | Magahi | |
| mah | mah | Marshall | |
| mai | mai | Maithili | |
| mak | mak | Makasar | |
| mal | mal | Malayalam | ml |
| man | man | Mandingo | |
| map | map | Austronesian (Other) | |
| mar | mar | Marathi | mr |
| mas | mas | Masai | |
| max | max | Manx | |
| mdr | mdr | Mandar | |
| men | men | Mende | |
| mga | mga | Irish, Middle (900-1200) | |
| mic | mic | Micmac | |
| min | min | Minangkabau | |
| mis | mis | Miscellaneous languages | |
| mkd | mac | Macedonian | mk |
| mkh | mkh | Mon-Khmer (Other) | |
| mlg | mlg | Malagasy | mg |
| mlt | mlt | Maltese | mt |
| mni | mni | Manipuri | |
| mno | mno | Manobo languages | |
| moh | moh | Mohawk | |
| mol | mol | Moldavian | mo |
| mon | mon | Mongolian | mn |
| mos | mos | Mossi | |
| mri | mao | Maori | mi |
| msa | may | Malay | ms |
| mul | mul | Multiple languages | |
| mun | mun | Munda languages | |
| mus | mus | Creek | |
| mwr | mwr | Marwari | |
| mya | bur | Burmese | my |
| myn | myn | Mayan languages | |
| nah | nah | Aztec | |
| nai | nai | North American Indian (Other) | |
| nau | nau | Nauru | na |
| nav | nav | Navajo | |
| nbl | nbl | Ndebele, South | |
| nde | nde | Ndebele, North | |
| ndo | ndo | Ndonga | |
| nep | nep | Nepali | ne |
| new | new | Newari | |
| nia | nia | Nias | |
| nic | nic | Niger-Kordofanian (Other) | |
| niu | niu | Niuean | |
| nld | dut | Dutch | nl |
| non | non | Norse, Old | |
| nor | nor | Norwegian | no |
| nso | nso | Sohto, Northern | |
| nub | nub | Nubian languages | |
| nya | nya | Nyanja | |
| nym | nym | Nyamwezi | |
| nyn | nyn | Nyankole | |
| nyo | nyo | Nyoro | |
| nzi | nzi | Nzima | |
| oci | oci | Occitan (post 1500) | oc |
| oji | oji | Ojibwa | |
| ori | ori | Oriya | |
| orm | orm | Oromo | om |
| osa | osa | Osage | |
| oss | oss | Ossetic | |
| ota | ota | Turkish, Ottoman (1500-1928) | |
| oto | oto | Otomian languages | |
| paa | paa | Papuan (Other) | |
| pag | pag | Pangasinan | |
| pal | pal | Pahlavi | |
| pam | pam | Pampanga | |
| pan | pan | Panjabi | pa |
| pap | pap | Papiamento | |
| pau | pau | Palauan | |
| peo | peo | Persian, Old (ca. 600-400 B.C.) | |
| phi | phi | Philippine (Other) | |
| phn | phn | Phoenician | |
| pli | pli | Pali | |
| pol | pol | Polish | pl |
| pon | pon | Pohnpeian | |
| por | por | Portuguese | pt |
| pra | pra | Prakrit languages | |
| pro | pro | Provençal, Old (to 1500) | |
| pus | pus | Pushto | ps |
| qaa-qtz | qaa-qtz | reserved for local use | |
| que | que | Quechua | qu |
| raj | raj | Rajasthani | |
| rap | rap | Rapanui | |
| rar | rar | Rarotongan | |
| roa | roa | Romance (Other) | |
| roh | roh | Rhaeto-Romance | rm |
| rom | rom | Romany | |
| ron | rum | Romanian | ro |
| run | run | Rundi | rn |
| rus | rus | Russian | ru |
| sad | sad | Sandawe | |
| sag | sag | Sango | sg |
| sai | sai | South American Indian (Other) | |
| sal | sal | Salishan languages | |
| sam | sam | Samaritan Aramaic | |
| san | san | Sanskrit | sa |
| sas | sas | Sasak | |
| sat | sat | Santali | |
| sco | sco | Scots | |
| sel | sel | Selkup | |
| sem | sem | Semitic (Other) | |
| sga | sga | Irish, Old (to 900) | |
| shn | shn | Shan | |
| sid | sid | Sidamo | |
| sin | sin | Sinhalese | si |
| sio | sio | Siouan languages | |
| sit | sit | Sino-Tibetan (Other) | |
| sla | sla | Slavic (Other) | |
| slk | slo | Slovak | sk |
| slv | slv | Slovenian | sl |
| smi | smi | Sámi languages | se |
| smo | smo | Samoan | sm |
| sna | sna | Shona | sn |
| snd | snd | Sindhi | sd |
| snk | snk | Soninke | |
| sog | sog | Sogdian | |
| som | som | Somali | so |
| son | son | Songhai | |
| sot | sot | Sotho, Southern | st |
| spa | spa | Spanish | es |
| sqi | alb | Albanian | sq |
| srd | srd | Sardinian | |
| srp | scc | Serbian | sr |
| srr | srr | Serer | |
| ssa | ssa | Nilo-Saharan (Other) | |
| ssw | ssw | Swati | ss |
| suk | suk | Sukuma | |
| sun | sun | Sundanese | su |
| sus | sus | Susu | |
| sux | sux | Sumerian | |
| swa | swa | Swahili | sw |
| swe | swe | Swedish | sv |
| syr | syr | Syriac | |
| tah | tah | Tahitian | |
| tai | tai | Tai (Other) | |
| tam | tam | Tamil | ta |
| tat | tat | Tatar | tt |
| tel | tel | Telugu | te |
| tem | tem | Timne | |
| ter | ter | Tereno | |
| tet | tet | Tetum | |
| tgk | tgk | Tajik | tg |
| tgl | tgl | Tagalog | tl |
| tha | tha | Thai | th |
| tig | tig | Tigre | |
| tir | tir | Tigrinya | |
| tiv | tiv | Tiv | |
| tkl | tkl | Tokelau | |
| tli | tli | Tlingit | |
| tmh | tmh | Tamashek | |
| tog | tog | Tonga (Nyasa) | |
| ton | ton | Tonga (Tonga Islands) | |
| tpi | tpi | Tok Pisin | |
| tsi | tsi | Tsimshian | |
| tsn | tsn | Tswana | ts |
| tso | tso | Tsonga | |
| tuk | tuk | Türkmen | tk |
| tum | tum | Tumbuka | |
| tur | tur | Turkish | |
| tut | tut | Altaic (Other) | |
| tvl | tvl | Tuvalu | |
| twi | twi | Twi | tw |
| tyv | tyv | Tuvinian | |
| uga | uga | Ugaritic | |
| uig | uig | Uighur | ug |
| ukr | ukr | Ukrainian | uk |
| umb | umb | Umbundu | |
| und | und | Undetermined | |
| urd | urd | Urdu | ur |
| uzb | uzb | Uzbek | uz |
| vai | vai | Vai | |
| ven | ven | Venda | |
| vie | vie | Vietnamese | vi |
| vol | vol | Volapük | vo |
| vot | vot | Votic | |
| wak | wak | Wakashan languages | |
| wal | wal | Walamo | |
| war | war | Waray | |
| was | was | Washo | |
| wen | wen | Sorbian languages | |
| wol | wol | Wolof | wo |
| xho | xho | Xhosa | xh |
| yao | yao | Yao | |
| yap | yap | Yapese | |
| yid | yid | Yiddish | yi/ji |
| yor | yor | Yoruba | |
| ypk | ypk | Yupik languages | |
| zap | zap | Zapotec | |
| zen | zen | Zenaga | |
| zha | zha | Zhuang | za |
| zho | chi | Chinese | zh |
| znd | znd | Zande | |
| zul | zul | Zulu | zu |
| zun | zun | Zuńi | |
| T | B | Language name (in English) | 639-1 |