| Language | Name | Code |
|---|---|---|
| Afrikaans | Belfast | af |
| Amharic | ቤልፋስት | am |
| Aragonese | Béal Feirste | an |
| Arabic | بلفاست | ar |
| arz | بلفاست | arz |
| Asturian | Belfast | ast |
| Azerbaijani | Belfast | az |
| azb | بلفاست | azb |
| ban | Belfast | ban |
| Belarusian | Белфаст | be |
| be-tarask | Бэлфаст | be-tarask |
| bew | Bèlpas | bew |
| Bulgarian | Белфаст | bg |
| bho | बेलफास्ट | bho |
| Bengali | বেলফাস্ট | bn |
| Breton | Béal Feirste | br |
| Bosnian | Belfast | bs |
| bxr | Белфаст | bxr |
| Catalan | Belfast | ca |
| Cebuano | Belfast | ceb |
| Central Kurdish | بێڵفێست | ckb |
| Czech | Belfast | cs |
| Chuvash | Белфаст | cv |
| Welsh | Belffast | cy |
| Danish | Belfast | da |
| German | Belfast | de |
| diq | Belfast | diq |
| Modern Greek (1453-) | Μπέλφαστ | el |
| English | Belfast | en |
| en-ca | Belfast | en-ca |
| en-gb | Belfast | en-gb |
| Esperanto | Belfasto | eo |
| Spanish | Belfast | es |
| Estonian | Belfast | et |
| Basque | Belfast | eu |
| ext | Belfast | ext |
| Persian | بلفاست | fa |
| Finnish | Belfast | fi |
| Faroese | Belfast | fo |
| French | Belfast | fr |
| frr | Belfast (Nuurdirlun) | frr |
| Western Frisian | Belfast | fy |
| Irish | Béal Feirste | ga |
| Scottish Gaelic | Beul Feirste | gd |
| Galician | Belfast | gl |
| Guaraní | Belfast | gn |
| Gujarati | બેલફાસ્ટ | gu |
| Manx | Beeal Feirshtey | gv |
| Hebrew | בלפסט | he |
| Hindi | बेलफ़ास्ट | hi |
| Croatian | Belfast | hr |
| Upper Sorbian | Belfast | hsb |
| Haitian | Bèlfast | ht |
| Hungarian | Belfast | hu |
| Armenian | Բելֆասթ | hy |
| hyw | Պելֆասթ | hyw |
| Interlingua (International Auxiliary Language Association) | Belfast | ia |
| iba | Belfast | iba |
| Indonesian | Belfast | id |
| Interlingue | Belfast | ie |
| Ido | Belfast | io |
| Icelandic | Belfast | is |
| Italian | Belfast | it |
| Japanese | ベルファスト | ja |
| Javanese | Belfast | jv |
| Georgian | ბელფასტი | ka |
| kab | Belfast | kab |
| kge | Belfast | kge |
| Kazakh | Белфаст | kk |
| Kalaallisut | Belfast | kl |
| Kannada | ಬೆಲ್ ಫಾಸ್ಟ್ | kn |
| Korean | 벨파스트 | ko |
| Kurdish | Belfast | ku |
| Kirghiz | Белфаст | ky |
| Latin | Belfastum | la |
| Luxembourgish | Belfast | lb |
| Limburgan | Belfast | li |
| lij | Belfast | lij |
| lmo | Belfast | lmo |
| Lithuanian | Belfastas | lt |
| Latvian | Belfāsta | lv |
| Macedonian | Белфаст | mk |
| Malayalam | ബെൽഫാസ്റ്റ് | ml |
| Mongolian | Бельфаст | mn |
| mni | ꯕꯦꯜꯐꯥꯁ꯭ꯠ | mni |
| Marathi | बेलफास्ट | mr |
| Malay (macrolanguage) | Belfast | ms |
| Maltese | Belfast | mt |
| Burmese | ဗဲလဖတ်မြို့ | my |
| mzn | بلفاست | mzn |
| nah | Belfast | nah |
| nan | Belfast | nan |
| Norwegian Bokmål | Belfast | nb |
| nds-nl | Belfast | nds-nl |
| Dutch | Belfast | nl |
| Norwegian Nynorsk | Belfast | nn |
| Narom | Belfast | nrm |
| Occitan (post 1500) | Béal Feirste | oc |
| Ossetian | Белфаст | os |
| pcd | Belfast | pcd |
| Polish | Belfast | pl |
| pms | Belfast | pms |
| pnb | بیلفاسٹ | pnb |
| Pushto | بلفاست | ps |
| Portuguese | Belfast | pt |
| pt-br | Belfast | pt-br |
| Quechua | Belfast | qu |
| rmy | Belfast | rmy |
| Romanian | Belfast | ro |
| Russian | Белфаст | ru |
| rup | Belfast | rup |
| Sardinian | Belfast | sc |
| Sicilian | Belfast | scn |
| Scots | Belfast | sco |
| sh | Belfast | sh |
| Sinhala | බෙල්ෆාස්ට් | si |
| Slovak | Belfast | sk |
| Slovenian | Belfast | sl |
| Albanian | Belfast | sq |
| Serbian | Белфаст | sr |
| Swedish | Belfast | sv |
| Swahili (macrolanguage) | Belfast | sw |
| szl | Belfast | szl |
| Tamil | பெல்பாஸ்ட் | ta |
| Telugu | బెల్ఫాస్ట్ | te |
| Tajik | Белфаст | tg |
| Thai | เบลฟาสต์ | th |
| Tagalog | Belfast | tl |
| tly | Belfast | tly |
| Turkish | Belfast | tr |
| Tatar | Белфаст | tt |
| udm | Белфаст | udm |
| Uighur | Bélfast | ug |
| Ukrainian | Белфаст | uk |
| Urdu | بیلفاسٹ | ur |
| Uzbek | Belfast | uz |
| vec | Béal Feirste | vec |
| Vietnamese | Belfast | vi |
| vls | Belfast | vls |
| war | Belfast | war |
| Wu Chinese | 贝尔法斯特 | wuu |
| Yiddish | בעלפאסט | yi |
| Yoruba | Belfast | yo |
| yue | 貝爾法斯特 | yue |
| zea | Belfast | zea |
| zgh | ⴱⵉⵍⴼⴰⵙⵜ | zgh |
| Chinese | 贝尔法斯特 | zh |
| zh-cn | 贝尔法斯特 | zh-cn |
| zh-hans | 贝尔法斯特 | zh-hans |
| zh-hant | 貝爾法斯特 | zh-hant |
| zh-tw | 貝爾法斯特 | zh-tw |