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MARC (MAchine-Readable Cataloging) is a set of standards for encoding metadata about library materials.

MARC defines a set of 434 language codes, for use in a number of fields. Codes may refer to anything from a specific dialect of a language to a language family, depending on the whim of the committee.

Of course they are used in

041 Language Code 
But language codes are also needed for
008/35-37 Fixed-Length Data Elements / Language
040 Source / Language of cataloging
084 Classification Scheme and Edition / Language code
242 Translation of Title by Cataloging Agency / Language code of translated title
775 Other Edition Entry / Language code

The 472 defined codes as of June 12, 2002, sorted by language, are as follows. A leading "-" means that the code is discontinued.

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

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