| Language | Name | Code |
|---|---|---|
| Afrikaans | Oulu | af |
| Aragonese | Oulu | an |
| Arabic | أولو | ar |
| arz | اولو | arz |
| Asturian | Oulu | ast |
| Aymara | Oulu | ay |
| Azerbaijani | Oulu | az |
| Bashkir | Оулу | ba |
| Belarusian | Оўлу | be |
| be-tarask | Оўлу | be-tarask |
| Bulgarian | Оулу | bg |
| Bengali | ওউলু | bn |
| Breton | Oulu | br |
| Bosnian | Oulu | bs |
| Catalan | Oulu | ca |
| Chechen | Оулу | ce |
| Cebuano | Oulu | ceb |
| Czech | Oulu | cs |
| Welsh | Oulu | cy |
| Danish | Oulu | da |
| German | Oulu | de |
| de-ch | Oulu | de-ch |
| diq | Oulu | diq |
| Modern Greek (1453-) | Όουλου | el |
| English | Oulu | en |
| en-ca | Oulu | en-ca |
| en-gb | Oulu | en-gb |
| Esperanto | Oulu | eo |
| Spanish | Oulu | es |
| Estonian | Oulu linn | et |
| Basque | Oulu | eu |
| Persian | اولو، فنلاند | fa |
| Finnish | Oulu | fi |
| Fijian | Oulu | fj |
| French | Oulu | fr |
| frr | Oulu | frr |
| Irish | Oulu | ga |
| Scottish Gaelic | Oulu | gd |
| Galician | Oulu | gl |
| gsw | Oulu | gsw |
| Gujarati | ઔલૂ | gu |
| Hausa | Oulu | ha |
| Hebrew | אואולו | he |
| Hindi | औलू | hi |
| Croatian | Oulu | hr |
| Haitian | Oulu | ht |
| Hungarian | Oulu | hu |
| Armenian | Օուլու | hy |
| Indonesian | Oulu | id |
| Ido | Oulu | io |
| Icelandic | Oulu | is |
| Italian | Oulu | it |
| Japanese | オウル | ja |
| Georgian | ოულუ | ka |
| Kalaallisut | Oulu | kl |
| Kannada | ಔಲು | kn |
| Korean | 오울루 | ko |
| koi | Овлу | koi |
| Cornish | Oulu | kw |
| Latin | Uloa | la |
| lmo | Oulu | lmo |
| Lithuanian | Oulu | lt |
| Latvian | Oulu | lv |
| mdf | Оулу | mdf |
| mhr | Оулу | mhr |
| Maori | Oulu | mi |
| Macedonian | Оулу | mk |
| Marathi | ओउलू | mr |
| mrj | Оулу | mrj |
| Malay (macrolanguage) | Oulu | ms |
| mul | Oulu | mul |
| myv | Оулу ош | myv |
| Nauru | Oulu | na |
| Norwegian Bokmål | Uleåborg | nb |
| Low German | Oulu | nds |
| Dutch | Oulu | nl |
| Norwegian Nynorsk | Uleåborg | nn |
| Occitan (post 1500) | Oulu | oc |
| Livvi | Oulu | olo |
| Ossetian | Оулу | os |
| Polish | Oulu | pl |
| pnb | اوؤلو | pnb |
| Portuguese | Oulu | pt |
| pt-br | Oulu | pt-br |
| Quechua | Oulu | qu |
| Romanian | Oulu | ro |
| Russian | Оулу | ru |
| Sicilian | Oulu | scn |
| Scots | Oulu | sco |
| Northern Sami | Oulu | se |
| sh | Oulu | sh |
| Sinhala | ඕලු | si |
| Slovak | Oulu | sk |
| Slovenian | Oulu | sl |
| smn | Oulu | smn |
| sms | Oulu | sms |
| Albanian | Oulu | sq |
| Serbian | Оулу | sr |
| Southern Sotho | Oulu | st |
| Swedish | Uleåborg | sv |
| szl | Oulu | szl |
| Tamil | ஓலு | ta |
| Telugu | ఔలు | te |
| Tetum | Oulu | tet |
| Thai | โอวลุ | th |
| Turkish | Oulu | tr |
| Tatar | Оулу | tt |
| tum | Oulu | tum |
| Ukrainian | Оулу | uk |
| Urdu | اولُو | ur |
| vec | Oulu | vec |
| vep | Oulu | vep |
| Vietnamese | Oulu | vi |
| Volapük | Oulu | vo |
| vro | Oulu | vro |
| war | Oulu | war |
| Wu Chinese | 奥卢 | wuu |
| yue | 奧盧 | yue |
| Chinese | 奥卢 | zh |
| zh-cn | 奥卢 | zh-cn |
| zh-hans | 奥卢 | zh-hans |
| zh-hant | 奧盧 | zh-hant |