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The Registration Authority for ISO 639 is Infoterm, Österreichisches Normungsinstitut (ON), Postfach 130, A-1021 Wien, Austria.
Contains additions from ISO 639/RA Newsletter No. 1/1989, and from a decision of the Advisory Committee of ISO/TC37 on 1997-08-27 in Copenhagen.
| Code | English name of the language |
| aa | Afar |
| ab | Abkhazian |
| af | Afrikaans |
| am | Amharic |
| ar | Arabic |
| as | Assamese |
| ay | Aymara |
| az | Azerbaijani |
| ba | Bashkir |
| be | Byelorussian (recte Belarussian) |
| bg | Bulgarian |
| bh | Bihari |
| bi | Bislama |
| bn | Bengali; Bangla |
| bo | Tibetan |
| br | Breton |
| ca | Catalan |
| co | Corsican |
| cs | Czech |
| cy | Welsh |
| da | Danish |
| de | German |
| dz | Bhutani |
| el | Greek |
| en | English |
| eo | Esperanto |
| es | Spanish |
| et | Estonian |
| eu | Basque |
| fa | Persian |
| fi | Finnish |
| fj | Fiji |
| fo | Faroese |
| fr | French |
| fy | Frisian |
| ga | Irish (recte Irish Gaelic) |
| gd | Scots Gaelic (recte Scottish Gaelic) |
| gl | Galician |
| gn | Guarani |
| gu | Gujarati |
| gv | Manx Gaelic
|
| ha | Hausa |
| he | Hebrew (formerly iw) |
| hi | Hindi |
| hr | Croatian |
| hu | Hungarian |
| hy | Armenian |
| ia | Interlingua |
| id | Indonesian (formerly in) |
| ie | Interlingue |
| ik | Inupiak |
| is | Icelandic |
| it | Italian |
| iu | Inuktitut |
| ja | Japanese |
| jw | Javanese |
| ka | Georgian |
| kk | Kazakh |
| kl | Greenlandic |
| km | Cambodian |
| kn | Kannada |
| ko | Korean |
| ks | Kashmiri |
| ku | Kurdish |
| kw | Cornish
|
| ky | Kirghiz |
| la | Latin |
| lb | Luxemburgish
|
| ln | Lingala |
| lo | Laothian (recte Laotian) |
| lt | Lithuanian |
| lv | Latvian; Lettish |
| mg | Malagasy |
| mi | Maori |
| mk | Macedonian |
| ml | Malayalam |
| mn | Mongolian |
| mo | Moldavian |
| mr | Marathi |
| ms | Malay |
| mt | Maltese |
| my | Burmese |
| na | Nauru |
| ne | Nepali |
| nl | Dutch |
| no | Norwegian |
| oc | Occitan |
| om | (Afan) Oromo |
| or | Oriya |
| pa | Punjabi |
| pl | Polish |
| ps | Pashto, Pushto |
| pt | Portuguese |
| qu | Quechua |
| rm | Rhaeto-Romance |
| rn | Kirundi |
| ro | Romanian |
| ru | Russian |
| rw | Kinyarwanda |
| sa | Sanskrit |
| sd | Sindhi |
| se | Northern Sámi
|
| sg | Sangho |
| sh | Serbo-Croatian |
| si | Singhalese |
| sk | Slovak |
| sl | Slovenian |
| sm | Samoan |
| sn | Shona |
| so | Somali |
| sq | Albanian |
| sr | Serbian |
| ss | Siswati |
| st | Sesotho |
| su | Sundanese |
| sv | Swedish |
| sw | Swahili |
| ta | Tamil |
| te | Telugu |
| tg | Tajik |
| th | Thai |
| ti | Tigrinya |
| tk | Turkmen |
| tl | Tagalog |
| tn | Setswana |
| to | Tonga |
| tr | Turkish |
| ts | Tsonga |
| tt | Tatar |
| tw | Twi |
| ug | Uigur |
| uk | Ukrainian |
| ur | Urdu |
| uz | Uzbek |
| vi | Vietnamese |
| vo | Volapük |
| wo | Wolof |
| xh | Xhosa |
| yi | Yiddish (formerly ji) |
| yo | Yoruba |
| za | Zhuang |
| zh | Chinese |
| zu | Zulu |
| Code | English name of the language |