В следующей таблице перечислены двухбуквенные языковые коды ISO 639 (отсортированные в алфавитном порядке по языкам), которые можно использовать с атрибутами lang и xml:lang для указания языка, содержащегося внутри элемента в документе HTML и XHTML. Языковые коды нечувствительны к регистру.
| Семейство языков | Язык | Код-ISO |
|---|---|---|
| Northwest Caucasian | Abkhazian | ab |
| Afro-Asiatic | Afar | aa |
| Indo-European | Afrikaans | af |
| ndo-European | Albanian | sq |
| Afro-Asiatic | Amharic | am |
| Afro-Asiatic | Arabic | ar |
| Indo-European | Aragonese | an |
| Indo-European | Armenian | hy |
| Indo-European | Assamese | as |
| Aymaran | Aymara | ay |
| Turkic | Azerbaijani | az |
| Turkic | Bashkir | ba |
| Language isolate | Basque | eu |
| Indo-European | Bengali (Bangla) | bn |
| Sino-Tibetan | Bhutani | dz |
| Indo-European | Bihari | bh |
| Creole | Bislama | bi |
| Indo-European | Breton | br |
| Indo-European | Bulgarian | bg |
| Sino-Tibetan | Burmese | my |
| Indo-European | Byelorussian (Belarusian) | be |
| Austro-Asiatic | Cambodian | km |
| Indo-European | Catalan | ca |
| Sino-Tibetan | Chinese | zh |
| Indo-European | Corsican | co |
| Indo-European | Croatian | hr |
| Indo-European | Czech | cs |
| Indo-European | Danish | da |
| Indo-European | Dutch | nl |
| Indo-European | English (American) | en |
| Constructed | Esperanto | eo |
| Uralic | Estonian | et |
| Indo-European | Faeroese | fo |
| Indo-European | Farsi | fa |
| Austronesian | Fiji | fj |
| Uralic | Finnish | fi |
| Indo-European | French | fr |
| Indo-European | Frisian | fy |
| Indo-European | Gaelic (Scottish) | gd |
| Indo-European | Gaelic (Manx) | gv |
| Indo-European | Galician | gl |
| South Caucasian | Georgian | ka |
| Indo-European | German | de |
| Indo-European | Greek | el |
| Eskimo-Aleut | Kalaallisut (Greenlиic) | kl |
| Tupian | Guarani | gn |
| Indo-European | Gujarati | gu |
| Creole | Haitian Creole | ht |
| Afro-Asiatic | Hausa | ha |
| Afro-Asiatic | Hebrew | he, iw |
| Indo-European | Hindi | hi |
| Uralic | Hungarian | hu |
| Indo-European | Icelиic | is |
| Constructed | Ido | io |
| Austronesian | Indonesian | id, in |
| Constructed | Interlingua | ia |
| Constructed | Interlingue | ie |
| Eskimo-Aleut | Inuktitut | iu |
| Eskimo-Aleut | Inupiak | ik |
| Indo-European | Irish | ga |
| Indo-European | Italian | it |
| Japonic | Japanese | ja |
| Austronesian | Javanese | jv |
| Dravidian | Kannada | kn |
| Indo-European | Kashmiri | ks |
| Turkic | Kazakh | kk |
| Niger-Congo | Kinyarwиa (Ruиa) | rw |
| Turkic | Kirghiz | ky |
| Niger-Congo | Kirundi (Rundi) | rn |
| Language isolate | Korean | ko |
| Indo-European | Kurdish | ku |
| Tai-Kadai | Laothian | lo |
| Indo-European | Latin | la |
| Indo-European | Latvian (Lettish) | lv |
| Indo-European | Limburgish ( Limburger) | li |
| Niger-Congo | Lingala | ln |
| Indo-European | Lithuanian | lt |
| Indo-European | Macedonian | mk |
| Austronesian | Malagasy | mg |
| Austronesian | Malay | ms |
| Austronesian | Malayalam | ml |
| Afro-Asiatic | Maltese | mt |
| Austronesian | Maori | mi |
| Indo-European | Marathi | mr |
| Indo-European | Moldavian | mo |
| Mongolic | Mongolian | mn |
| Austronesian | Nauru | na |
| Indo-European | Nepali | ne |
| Indo-European | Norwegian | no |
| Indo-European | Occitan | oc |
| Indo-European | Oriya | or |
| Afro-Asiatic | Oromo (Afan, Galla) | om |
| Indo-European | Pashto (Pushto) | ps |
| Indo-European | Polish | pl |
| Indo-European | Portuguese | pt |
| Indo-European | Punjabi | pa |
| Quechuan | Quechua | qu |
| Indo-European | Rhaeto-Romance | rm |
| Indo-European | Romanian | ro |
| Indo-European | Russian | ru |
| Austronesian | Samoan | sm |
| Creole | Sango | sg |
| Indo-European | Sanskrit | sa |
| Indo-European | Serbian | sr |
| Indo-European | Serbo-Croatian | sh |
| Niger-Congo | Sesotho | st |
| Niger-Congo | Setswana | tn |
| Niger-Congo | Shona | sn |
| Sino-Tibetan | Sichuan Yi | ii |
| Indo-European | Sindhi | sd |
| Indo-European | Sinhalese | si |
| Niger-Congo | Siswati | ss |
| Indo-European | Slovak | sk |
| Indo-European | Slovenian | sl |
| Afro-Asiatic | Somali | so |
| Indo-European | Spanish | es |
| Austronesian | Sundanese | su |
| Niger-Congo | Swahili (Kiswahili) | sw |
| Indo-European | Swedish | sv |
| Austronesian | Tagalog | tl |
| Indo-European | Tajik | tg |
| Dravidian | Tamil | ta |
| Turkic | Tatar | tt |
| Dravidian | Telugu | te |
| Tai-Kadai | Thai | th |
| Sino-Tibetan | Tibetan | bo |
| Afro-Asiatic | Tigrinya | ti |
| Austronesian | Tonga | to |
| Niger-Congo | Tsonga | ts |
| Turkic | Turkish | tr |
| Turkic | Turkmen | tk |
| Niger-Congo | Twi | tw |
| Turkic | Uighur | ug |
| Indo-European | Ukrainian | uk |
| Indo-European | Urdu | ur |
| Turkic | Uzbek | uz |
| Austro-Asiatic | Vietnamese | vi |
| Constructed | Volapük | vo |
| Indo-European | Wallon | wa |
| Indo-European | Welsh | cy |
| Niger-Congo | Wolof | wo |
| Niger-Congo | Xhosa | xh |
| Indo-European | Yiddish | yi, ji |
| Niger-Congo | Yoruba | yo |
| Niger-Congo | Zulu | zu |
