The sif-compliant codes for Native Languages are as follows. See the, "National Information Standards Organization (NISO)," section of the SIF Specification.
| Code | Language |
| aar | Afar |
| abk | Abkhaz |
| ace | Achinese |
| ach | Acoli |
| ada | Adangme |
| ady | Adygei |
| afa | Afroasiatic (Other) |
| afh | Afrihili (Artificial language) |
| afr | Afrikaans |
| ajm | Aljamía (Discontinued) |
| aka | Akan |
| akk | Akkadian |
| alb | Albanian |
| ale | Aleut |
| alg | Algonquian (Other) |
| amh | Amharic |
| ang | English, Old (ca. 450-1100) |
| apa | Apache languages |
| ara | Arabic |
| arc | Aramaic |
| arg | Aragonese Spanish |
| arm | Armenian |
| arn | Mapuche |
| arp | Arapaho |
| art | Artificial (Other) |
| arw | Arawak |
| asm | Assamese |
| ast | Bable |
| ath | Athapascan (Other) |
| aus | Australian languages |
| ava | Avaric |
| ave | Avestan |
| awa | Awadhi |
| aym | Aymara |
| aze | Azerbaijani |
| bad | Banda |
| bai | Bamileke languages |
| bak | Bashkir |
| bal | Baluchi |
| bam | Bambara |
| ban | Balinese |
| baq | Basque |
| bas | Basa |
| bat | Baltic (Other) |
| bej | Beja |
| bel | Belarusian |
| bem | Bemba |
| ben | Bengali |
| ber | Berber (Other) |
| bho | Bhojpuri |
| bih | Bihari |
| bik | Bikol |
| bin | Edo |
| bis | Bislama |
| bla | Siksika |
| bnt | Bantu (Other) |
| bos | Bosnian |
| bra | Braj |
| bre | Breton |
| btk | Batak |
| bua | Buriat |
| bug | Bugis |
| bul | Bulgarian |
| bur | Burmese |
| cad | Caddo |
| cai | Central American Indian (Other) |
| cam | Khmer (Discontinued) |
| car | Carib |
| cat | Catalan |
| cau | Caucasian (Other) |
| ceb | Cebuano |
| cel | Celtic (Other) |
| cha | Chamorro |
| chb | Chibcha |
| che | Chechen |
| chg | Chagatai |
| chi | Chinese |
| chk | Truk |
| chm | Mari |
| chn | Chinook jargon |
| cho | Choctaw |
| chp | Chipewyan |
| chr | Cherokee |
| chu | Church Slavic |
| chv | Chuvash |
| chy | Cheyenne |
| cmc | Chamic languages |
| cop | Coptic |
| cor | Cornish |
| cos | Corsican |
| cpe | Creoles and Pidgins, English-based (Other) |
| cpf | Creoles and Pidgins, French-based (Other) |
| cpp | Creoles and Pidgins, Portuguese-based (Other) |
| cre | Cree |
| crh | Crimean Tatar |
| crp | Creoles and Pidgins (Other) |
| cus | Cushitic (Other) |
| cze | Czech |
| dak | Dakota |
| dan | Danish |
| dar | Dargwa |
| day | Dayak |
| del | Delaware |
| den | Slave |
| dgr | Dogrib |
| din | Dinka |
| div | Divehi |
| doi | Dogri |
| dra | Dravidian (Other) |
| dua | Duala |
| dum | Dutch, Middle (ca. 1050-1350) |
| dut | Dutch |
| dyu | Dyula |
| dzo | Dzongkha |
| efi | Efik |
| egy | Egyptian |
| eka | Ekajuk |
| elx | Elamite |
| eng | English |
| enm | English, Middle (1100-1500) |
| epo | Esperanto |
| esk | Eskimo languages (Discontinued) |
| esp | Esperanto (Discontinued) |
| est | Estonian |
| eth | Ethiopic (Discontinued) |
| ewe | Ewe |
| ewo | Ewondo |
| fan | Fang |
| fao | Faroese |
| far | Faroese (Discontinued) |
| fat | Fanti |
| fij | Fijian |
| fin | Finnish |
| fiu | Finno-Ugrian (Other) |
| fon | Fon |
| fre | French |
| fri | Frisian (Discontinued) |
| frm | French, Middle (ca. 1400-1600) |
| fro | French, Old (ca. 842-1400) |
| fry | Frisian |
| ful | Fula |
| fur | Friulian |
| gaa | Gã |
| gae | Scottish Gaelic (Discontinued) |
| gag | Galician (Discontinued) |
| gal | Oromo |
| gay | Gayo |
| gba | Gbaya |
| gem | Germanic (Other) |
| geo | Georgian |
| ger | German |
| gez | Ethiopic |
| gil | Gilbertese |
| gla | Scottish Gaelic |
| gle | Irish |
| glg | Galician |
| glv | Manx |
| gmh | German, Middle High (ca. 1050-1500) |
| goh | German, Old High (ca. 750-1050) |
| gon | Gondi |
| gor | Gorontalo |
| got | Gothic |
| grb | Grebo |
| grc | Greek, Ancient (to 1453) |
| gre | Greek, Modern (1453- ) |
| grn | Guarani |
| gua | Guarani (Discontinued) |
| guj | Gujarati |
| gwi | Gwich'in |
| hai | Haida |
| hat | Haitian French Creole |
| hau | Hausa |
| haw | Hawaiian |
| heb | Hebrew |
| her | Herero |
| hil | Hiligaynon |
| him | Himachali |
| hin | Hindi |
| hit | Hittite |
| hmn | Hmong |
| hmo | Hiri Motu |
| hun | Hungarian |
| hup | Hupa |
| iba | Iban |
| ibo | Igbo |
| ice | Icelandic |
| ido | Ido |
| iii | Sichuan Yi |
| ijo | Ijo |
| iku | Inuktitut |
| ile | Interlingue |
| ilo | Iloko |
| ina | Interlingua (International Auxiliary Language Association) |
| inc | Indic (Other) |
| ind | Indonesian |
| ine | Indo-European (Other) |
| inh | Ingush |
| int | Interlingua (International Auxiliary Language Association) (Discontinued) |
| ipk | Inupiaq |
| ira | Iranian (Other) |
| iri | Irish (Discontinued) |
| iro | Iroquoian (Other) |
| ita | Italian |
| jav | Javanese |
| jpn | Japanese |
| jpr | Judeo-Persian |
| jrb | Judeo-Arabic |
| kaa | Kara-Kalpak |
| kab | Kabyle |
| kac | Kachin |
| kal | Kalâtdlisut |
| kam | Kamba |
| kan | Kannada |
| kar | Karen |
| kas | Kashmiri |
| kau | Kanuri |
| kaw | Kawi |
| kaz | Kazakh |
| kbd | Kabardian |
| kha | Khasi |
| khi | Khoisan (Other) |
| khm | Khmer |
| kho | Khotanese |
| kik | Kikuyu |
| kin | Kinyarwanda |
| kir | Kyrgyz |
| kmb | Kimbundu |
| kok | Konkani |
| kom | Komi |
| kon | Kongo |
| kor | Korean |
| kos | Kusaie |
| kpe | Kpelle |
| kro | Kru |
| kru | Kurukh |
| kua | Kuanyama |
| kum | Kumyk |
| kur | Kurdish |
| kus | Kusaie (Discontinued) |
| kut | Kutenai |
| lad | Ladino |
| lah | Lahnda |
| lam | Lamba |
| lan | Occitan (post-1500) (Discontinued) |
| lao | Lao |
| lap | Sami (Discontinued) |
| lat | Latin |
| lav | Latvian |
| lez | Lezgian |
| lim | Limburgish |
| lin | Lingala |
| lit | Lithuanian |
| lol | Mongo-Nkundu |
| loz | Lozi |
| ltz | Letzeburgesch |
| lua | Luba-Lulua |
| lub | Luba-Katanga |
| lug | Ganda |
| lui | Luiseño |
| lun | Lunda |
| luo | Luo (Kenya and Tanzania) |
| lus | Lushai |
| mac | Macedonian |
| mad | Madurese |
| mag | Magahi |
| mah | Marshallese |
| mai | Maithili |
| mak | Makasar |
| mal | Malayalam |
| man | Mandingo |
| mao | Maori |
| map | Austronesian (Other) |
| mar | Marathi |
| mas | Masai |
| max | Manx (Discontinued) |
| may | Malay |
| mdr | Mandar |
| men | Mende |
| mga | Irish, Middle (ca. 1100-1550) |
| mic | Micmac |
| min | Minangkabau |
| mis | Miscellaneous languages |
| mkh | Mon-Khmer (Other) |
| mla | Malagasy (Discontinued) |
| mlg | Malagasy |
| mlt | Maltese |
| mnc | Manchu |
| mni | Manipuri |
| mno | Manobo languages |
| moh | Mohawk |
| mol | Moldavian |
| mon | Mongolian |
| mos | Mooré |
| mul | Multiple languages |
| mun | Munda (Other) |
| mus | Creek |
| mwr | Marwari |
| myn | Mayan languages |
| nah | Nahuatl |
| nai | North American Indian (Other) |
| nap | Neapolitan Italian |
| nau | Nauru |
| nav | Navajo |
| nbl | Ndebele (South Africa) |
| nde | Ndebele (Zimbabwe) |
| ndo | Ndonga |
| nds | Low German |
| nep | Nepali |
| new | Newari |
| nia | Nias |
| nic | Niger-Kordofanian (Other) |
| niu | Niuean |
| nno | Norwegian (Nynorsk) |
| nob | Norwegian (Bokmål) |
| nog | Nogai |
| non | Old Norse |
| nor | Norwegian |
| nso | Northern Sotho |
| nub | Nubian languages |
| nya | Nyanja |
| nym | Nyamwezi |
| nyn | Nyankole |
| nyo | Nyoro |
| nzi | Nzima |
| oci | Occitan (post-1500) |
| oji | Ojibwa |
| ori | Oriya |
| orm | Oromo |
| osa | Osage |
| oss | Ossetic |
| ota | Turkish, Ottoman |
| oto | Otomian languages |
| paa | Papuan (Other) |
| pag | Pangasinan |
| pal | Pahlavi |
| pam | Pampanga |
| pan | Panjabi |
| pap | Papiamento |
| pau | Palauan |
| peo | Old Persian (ca. 600-400 B.C.) |
| per | Persian |
| phi | Philippine (Other) |
| phn | Phoenician |
| pli | Pali |
| pol | Polish |
| pon | Ponape |
| por | Portuguese |
| pra | Prakrit languages |
| pro | Provençal (to 1500) |
| pus | Pushto |
| que | Quechua |
| raj | Rajasthani |
| rap | Rapanui |
| rar | Rarotongan |
| roa | Romance (Other) |
| roh | Raeto-Romance |
| rom | Romani |
| rum | Romanian |
| run | Rundi |
| rus | Russian |
| sad | Sandawe |
| sag | Sango (Ubangi Creole) |
| sah | Yakut |
| sai | South American Indian (Other) |
| sal | Salishan languages |
| sam | Samaritan Aramaic |
| san | Sanskrit |
| sao | Samoan (Discontinued) |
| sas | Sasak |
| sat | Santali |
| scc | Serbian |
| sco | Scots |
| scr | Croatian |
| sel | Selkup |
| sem | Semitic (Other) |
| sga | Irish, Old (to 1100) |
| sgn | Sign languages |
| shn | Shan |
| sho | Shona (Discontinued) |
| sid | Sidamo |
| sin | Sinhalese |
| sio | Siouan (Other) |
| sit | Sino-Tibetan (Other) |
| sla | Slavic (Other) |
| slo | Slovak |
| slv | Slovenian |
| sma | Southern Sami |
| sme | Northern Sami |
| smi | Sami |
| smj | Lule Sami |
| smn | Inari Sami |
| smo | Samoan |
| sms | Skolt Sami |
| sna | Shona |
| snd | Sindhi |
| snh | Sinhalese (Discontinued) |
| snk | Soninke |
| sog | Sogdian |
| som | Somali |
| son | Songhai |
| sot | Sotho |
| spa | Spanish |
| srd | Sardinian |
| srr | Serer |
| ssa | Nilo-Saharan (Other) |
| sso | Sotho (Discontinued) |
| ssw | Swazi |
| suk | Sukuma |
| sun | Sundanese |
| sus | Susu |
| sux | Sumerian |
| swa | Swahili |
| swe | Swedish |
| swz | Swazi (Discontinued) |
| syr | Syriac |
| tag | Tagalog (Discontinued) |
| tah | Tahitian |
| tai | Tai (Other) |
| taj | Tajik (Discontinued) |
| tam | Tamil |
| tar | Tatar (Discontinued) |
| tat | Tatar |
| tel | Telugu |
| tem | Temne |
| ter | Terena |
| tet | Tetum |
| tgk | Tajik |
| tgl | Tagalog |
| tha | Thai |
| tib | Tibetan |
| tig | Tigré |
| tir | Tigrinya |
| tiv | Tiv |
| tkl | Tokelauan |
| tli | Tlingit |
| tmh | Tamashek |
| tog | Tonga (Nyasa) |
| ton | Tongan |
| tpi | Tok Pisin |
| tru | Truk (Discontinued) |
| tsi | Tsimshian |
| tsn | Tswana |
| tso | Tsonga |
| tsw | Tswana (Discontinued) |
| tuk | Turkmen |
| tum | Tumbuka |
| tup | Tupi languages |
| tur | Turkish |
| tut | Altaic (Other) |
| tvl | Tuvaluan |
| twi | Twi |
| tyv | Tuvinian |
| udm | Udmurt |
| uga | Ugaritic |
| uig | Uighur |
| ukr | Ukrainian |
| umb | Umbundu |
| und | Undetermined |
| urd | Urdu |
| uzb | Uzbek |
| vai | Vai |
| ven | Venda |
| vie | Vietnamese |
| vol | Volapük |
| vot | Votic |
| wak | Wakashan languages |
| wal | Walamo |
| war | Waray |
| was | Washo |
| wel | Welsh |
| wen | Sorbian languages |
| wln | Walloon |
| wol | Wolof |
| xal | Kalmyk |
| xho | Xhosa |
| yao | Yao (Africa) |
| yap | Yapese |
| yid | Yiddish |
| yor | Yoruba |
| ypk | Yupik languages |
| zap | Zapotec |
| zen | Zenaga |
| zha | Zhuang |
| znd | Zande |
| zul | Zulu |
| zun | Zuni |
| mxt | Mixteco |