# ISO 639:o

This is a list of ISO 639-3 language codes starting with O.
Index | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v | w | x | y | z
Abbreviations are used in the table as follows:
* Scope (Archived April 21, 2006, at the Wayback Machine. Additional archives: December 15, 2023.): I = individual language, M = macrolanguage, S = special code
* Type (Archived April 21, 2006, at the Wayback Machine. Additional archives: December 14, 2023.): A = ancient (extinct since ancient times), C = constructed, E = extinct (in recent times), H = historical (distinct from its modern form), L = living, S = special code
Retired codes are enclosed in (parentheses).
The column Family contains the generic English name of the language's family or macrolanguage.
| ISO 639 codes | ISO 639 codes | ISO 639 codes | Scope/Type | Family | Language names | Language names | Language names | Language names | Language names | Language names | Language names |
| 639-3 | 639-1 | 639-2B | Scope/Type | Family | Native | eng | fra | spa | zho | rus | deu |
| oaa | | | I/L | | | Orok | | | 鄂罗克语 | | |
| oac | | | I/L | | | Oroch | | | 鄂罗奇语 | | |
| oar | | | I/A | | | Aramaic, Old | | | 古阿拉米语 | | Altaramäisch |
| oav | | | I/H | | | Avar, Old | | | 古阿瓦尔语 | | |
| obi | | | I/E | | | Obispeño | | | | | |
| obk | | | I/L | | | Southern Bontok | | | | | |
| obl | | | I/L | | | Oblo | | | | | |
| obm | | | I/A | | | Moabite | | | 摩押语 | | |
| obo | | | I/L | | | Manobo, Obo | | | | | |
| obr | | | I/H | | | Burmese, Old | | | 古缅甸语 | | Altburmesisch |
| obt | | | I/H | | | Breton, Old | | | 古布列塔尼语 | | Altbretonisch |
| obu | | | I/L | | | Obulom | | | | | |
| oca | | | I/L | | | Ocaina | | ocaina | | | |
| (occ) | | | I/C | | | Occidental | | | | | |
| och | | | I/A | Chinese | | Old Chinese | | | 上古漢語 | | Altchinesisch |
| oci | oc | oci | I/L | Indo-European | occitan | Occitan (post 1500) | occitan (après 1500) | occitano | 奥克西唐语; 奥克西坦语; 奥克语 | окситанский | Okzitanisch |
| ocm | | | I/H | Austronesian | | Cham, Old | | | | | |
| oco | | | I/H | | | Cornish, Old | | | 古康沃尔语 | | |
| ocu | | | I/L | | | Matlatzinca, Atzingo | | | | | |
| oda | | | I/L | | | Odut | | | | | |
| odk | | | I/L | | | Od | | | | | |
| odt | | | I/H | | | Dutch, Old | | | 古荷兰语 | | |
| odu | | | I/L | | | Odual | | | | | |
| ofo | | | I/E | | | Ofo | ofo | | | | |
| ofs | | | I/H | Friesisch | | Frisian, Old | | | 古弗里西亚语 | | Altfriesisch |
| ofu | | | I/L | | | Efutop | | | | | |
| ogb | | | I/L | | | Ogbia | | | | | |
| ogc | | | I/L | | | Ogbah | | | | | |
| oge | | | I/H | | | Georgian, Old | | | 古格鲁吉亚语 | | Altgeorgisch |
| ogg | | | I/L | | | Ogbogolo | | | | | |
| (ogn) | | | I/L | | | Ogan | | | | | |
| ogo | | | I/L | | | Khana | | | | | |
| ogu | | | I/L | | | Ogbronuagum | | | | | |
| oht | | | I/A | | | Hittite, Old | | | 古赫梯语 | | |
| ohu | | | I/H | | | Hungarian, Old | | | 古匈牙利语 | | |
| oia | | | I/L | | | Oirata | | | | оирата | |
| oie | | | I/L | Nilo-Saharan | | Okolie | | | | | |
| oin | | | I/L | | | One, Inebu | | | | | |
| ojb | | | I/L | | Anishinaabemowin (Ojibwemowin) | Ojibwa, Northwestern | | | | | |
| ojc | | | I/L | | Anishinaabemowin (Ojibwemowin) | Ojibwa, Central | | | | | |
| ojg | | | I/L | | Nishnaabemwin (Jibwemwin) | Ojibwa, Eastern | | | | | |
| oji | oj | oji | M/L | Cree | ᐊᓂᔑᓇᐯᒧᐎᓐ (Anishinaabemowin) | Ojibwa | ojibwa | ojibwa | 奥吉布瓦语 | оджибва | |
| ojp | | | I/H | | | Japanese, Old | | | 古日语 | | |
| ojs | | | I/L | | ᐊᓂᔑᓂᓂᒧᐎᓐ (Anishininiimowin) | Ojibwa, Severn | | | | | |
| ojv | | | I/L | | | Ontong Java | | | | | Ontong Java |
| ojw | | | I/L | | Anihšināpēmowin (Nakawēmowin) | Ojibwa, Western | | | | | |
| oka | | | I/L | | | Okanagan | | | | | |
| okb | | | I/L | | | Okobo | | | | | |
| okc | | | I/L | Niger–Congo | | Kobo | | | | | |
| okd | | | I/L | | | Okodia | | | | | |
| oke | | | I/L | | | Okpe (Southwestern Edo) | | | | | |
| okg | | | I/E | | | Koko Babangk | | | | | |
| okh | | | I/L | | | Koresh-e Rostam | | | | | |
| oki | | | I/L | | | Okiek | | | | | |
| okj | | | I/E | | | Oko-Juwoi | | | | | |
| okk | | | I/L | | | One, Kwamtim | | | | | |
| okl | | | I/E | | | Old Kentish Sign Language | | | 古肯特手语 | | |
| okm | | | I/H | | | Korean, Middle (10th–16th centuries) | | | 中古朝鲜语 | | Mittelkoreanisch |
| okn | | | I/L | | | Oki-No-Erabu | | | 冲永良部岛琉球语 | | |
| oko | | | I/H | | | Korean, Old (3rd–9th centuries) | | | 古朝鲜语 | | Altkoreanisch |
| okr | | | I/L | | | Kirike | | | | | |
| oks | | | I/L | | | Oko-Eni-Osayen | | | | | |
| oku | | | I/L | | | Oku | | | | | |
| okv | | | I/L | | | Orokaiva | | | | | |
| okx | | | I/L | | | Okpe (Northwestern Edo) | | | | | |
| okz | | | I/H | Austroasiatic | | Khmer, Old | | | | | |
| ola | | | I/L | | | Walungge | | | | | |
| old | | | I/L | | | Mochi | | | | | |
| ole | | | I/L | | | Olekha | | | | | |
| olk | | | I/E | | | Olkol | | | | | |
| olm | | | I/L | | | Oloma | | | | | |
| olo | | | I/L | | | Livvi | | | | | |
| olr | | | I/L | | | Olrat | | | | | |
| olt | | | I/H | Indo-European | | Old Lithuanian | | | | | |
| olu | | | I/L | Niger–Congo | | Kuvale | | | | | |
| oma | | | I/L | | | Omaha-Ponca | omaha-ponca | omaha-ponca | | | |
| omb | | | I/L | | | Ambae, East | | | | | |
| omc | | | I/E | | | Mochica | | | | | |
| (ome) | | | I/E | | | Omejes | | | | | |
| omg | | | I/L | | | Omagua | | omagua | | | |
| omi | | | I/L | | | Omi | | | | | |
| omk | | | I/E | | | Omok | | | | | |
| oml | | | I/L | | | Ombo | | | | | |
| omn | | | I/A | | | Minoan | | | | | |
| omo | | | I/L | | | Utarmbung | | | | | |
| omp | | | I/H | | | Manipuri, Old | | | 古曼尼普尔语 | | |
| omr | | | I/H | | | Marathi, Old | | | 古马拉地语 | | |
| omt | | | I/L | | | Omotik | | | | | |
| omu | | | I/E | | | Omurano | | omurano | | | |
| omw | | | I/L | | | Tairora, South | | | | | |
| omx | | | I/H | | | Mon, Old | | | 古孟语 | | |
| omy | | | I/H | Austronesian | | Malay, Old | | | | | |
| ona | | | I/L | | | Ona | | | | | |
| onb | | | I/L | | | Lingao | | | 临高语 | | |
| one | | | I/L | | Onʌyota’a:ka | Oneida | oneida | oneida | 奥内达语 | | |
| ong | | | I/L | | | Olo | | | | | |
| oni | | | I/L | | | Onin | | | | | |
| onj | | | I/L | | | Onjob | | | | | |
| onk | | | I/L | | | One, Kabore | | | | | |
| onn | | | I/L | | | Onobasulu | | | | | |
| ono | | | I/L | | Onǫta’kéka’ | Onondaga | onondaga | onondaga | | | |
| onp | | | I/L | | | Sartang | | | | | |
| onr | | | I/L | | | One, Northern | | | | | |
| ons | | | I/L | | | Ono | | | | | |
| ont | | | I/L | | | Ontenu | | | | | |
| onu | | | I/L | | | Unua | | | | | |
| onw | | | I/H | | | Nubian, Old | | | 古努比亚语 | | |
| onx | | | I/L | | | Onin Based Pidgin | | | | | |
| ood | | | I/L | | O'odham | Tohono O'odham | papago | pápago | | тогоно о'одам | Tohono O'odham |
| oog | | | I/L | | | Ong | | | | | |
| oon | | | I/L | | | Önge | | | | | |
| oor | | | I/L | | | Oorlams | | | | | |
| oos | | | I/A | | | Ossetic, Old | | | 古奥塞梯语 | | |
| opa | | | I/L | | | Okpamheri | | | | | |
| (ope) | | | I/H | | | Old Persian | | | | | |
| opk | | | I/L | | | Kopkaka | | | | | |
| opm | | | I/L | | | Oksapmin | | | | | |
| opo | | | I/L | | | Opao | | | | | |
| opt | | | I/E | | | Opata | | ópata | | | |
| opy | | | I/L | | | Ofayé | | | | | |
| ora | | | I/L | | | Oroha | | | | | |
| orc | | | I/L | | | Orma | | | | | |
| ore | | | I/L | | | Orejón | | orejón | | | |
| org | | | I/L | | | Oring | | | | | |
| orh | | | I/L | | | Oroqen | | | 鄂伦春语 | | |
| ori | or | ori | M/L | Indo-European | ଓଡ଼ିଆ | Oriya | oriya | oriya | 奥利亚语; 奥里亚语 | ория | Oriya |
| (ork) | | | I/L | | | Orokaiva | | | | | |
| orm | om | orm | M/L | Afro-Asiatic | Oromoo | Oromo | galla | oromo | 奥罗莫语 | оромо | Oromo |
| orn | | | I/L | | | Orang Kanaq | | | | | |
| oro | | | I/L | | | Orokolo | | | | | |
| orr | | | I/L | | | Oruma | | | | | |
| ors | | | I/L | | | Orang Seletar | | | | | |
| ort | | | I/L | | | Oriya, Adivasi | | | | | |
| oru | | | I/L | | | Ormuri | | | | | |
| orv | | | I/H | | | Russian, Old | | | 古俄语 | | |
| orw | | | I/L | | | Oro Win | | oro win | | | |
| orx | | | I/L | | | Oro | | | | | |
| ory | | | I/L | | | Oriya (individual language) | | | | | |
| orz | | | I/L | | | Ormu | | | | | |
| osa | | osa | I/L | | 𐓏𐓘𐓻𐓘𐓻𐓟 | Osage | osage | osage | 奥萨格语 | оседжи | |
| osc | | | I/A | | | Oscan | osque | osco | 奥斯坎语 | оскский | Oskisch |
| osi | | | I/L | | | Osing | | | | | |
| osn | | | I/H | Austronesian | | Sundanese, Old | | | | | |
| oso | | | I/L | | | Ososo | | | | | |
| osp | | | I/H | | | Spanish, Old | | | 古西班牙语 | | |
| oss | os | oss | I/L | Indo-European | ирон | Ossetian | ossète | oseto | 奥塞梯语; 奥塞提语 | осетинский | Ossetisch |
| ost | | | I/L | | | Osatu | | | | | |
| osu | | | I/L | | | One, Southern | | | | | |
| osx | | | I/H | | | Saxon, Old | | | 古撒克逊语 | | |
| ota | | ota | I/H | | لسان عثمانى | Turkish, Ottoman (1500–1928) | Turc ottoman | Turco-otomano | 奥斯曼土耳其语 | старотурецкий | Osmanisch |
| otb | | | I/H | | | Tibetan, Old | | | 古藏语 | | |
| otd | | | I/L | | | Dohoi | | | | | |
| ote | | | I/L | | | Otomi, Mezquital | | | | | |
| oti | | | I/E | | | Oti | | | | | |
| otk | | | I/H | | | Turkish, Old | | | 古突厥语 | | |
| otl | | | I/L | | | Otomi, Tilapa | | | | | |
| otm | | | I/L | | | Otomi, Eastern Highland | | | | | |
| otn | | | I/L | | | Otomi, Tenango | | | | | |
| otq | | | I/L | | | Otomi, Querétaro | | | | | |
| otr | | | I/L | | | Otoro | | | | | |
| ots | | | I/L | | | Otomi, Estado de México | | | | | |
| ott | | | I/L | | | Otomi, Temoaya | | | | | |
| otu | | | I/E | | | Otuke | | | | | |
| otw | | | I/L | | Nishnaabemwin (Daawaamwin) | Ottawa | ottawa | | | | |
| otx | | | I/L | | | Otomi, Texcatepec | | | | | |
| oty | | | I/A | | | Tamil, Old | | | 古泰米尔语 | | |
| otz | | | I/L | | | Otomi, Ixtenco | | | | | |
| oua | | | I/L | | | Tagargrent | | | | | |
| oub | | | I/L | | | Glio-Oubi | | | | | |
| oue | | | I/L | | | Oune | | | | | |
| oui | | | I/H | | | Uighur, Old | | | 回鹘语 | | |
| oum | | | I/E | | | Ouma | | | | | |
| (oun) | | | I/L | | | !O!ung | | | | | |
| ovd | | | I/L | Indo-European | | Elfdalian, Övdalian | | | | | |
| owi | | | I/L | | | Owiniga | | | | | |
| owl | | | I/H | | | Welsh, Old | | | 古威尔士语 | | |
| oyb | | | I/L | | | Oy | | | | | |
| oyd | | | I/L | | | Oyda | | | | | |
| oym | | | I/L | | | Wayampi | | wayampi | | | |
| oyy | | | I/L | | | Oya'oya | | | | | |
| ozm | | | I/L | | | Koonzime | | | | | |