| Language | Name | Code |
|---|---|---|
| Afrikaans | Kassel | af |
| Aragonese | Kassel | an |
| ang | Kassel | ang |
| Arabic | كاسل | ar |
| Asturian | Kassel | ast |
| Azerbaijani | Kassel | az |
| azb | کاسل | azb |
| Bashkir | Кассель | ba |
| ban | Kassel | ban |
| Bavarian | Kassel | bar |
| Belarusian | Касель | be |
| be-tarask | Касэль | be-tarask |
| Bulgarian | Касел | bg |
| Bengali | কাসেল | bn |
| Breton | Kassel | br |
| Catalan | Kassel | ca |
| Chechen | Кассель | ce |
| Cebuano | Kassel (kapital sa distrito nga gobyerno) | ceb |
| Central Kurdish | کاسل | ckb |
| Corsican | Kassel | co |
| Czech | Kassel | cs |
| Chuvash | Кассель | cv |
| Welsh | Kassel | cy |
| Danish | Kassel | da |
| German | Kassel | de |
| de-at | Kassel | de-at |
| de-ch | Kassel | de-ch |
| diq | Kassel | diq |
| dsb | Kassel | dsb |
| Modern Greek (1453-) | Κάσσελ | el |
| English | Kassel | en |
| en-ca | Kassel | en-ca |
| en-gb | Kassel | en-gb |
| Esperanto | Kaselo | eo |
| Spanish | Kassel | es |
| Estonian | Kassel | et |
| Basque | Kassel | eu |
| Persian | کاسل | fa |
| Finnish | Kassel | fi |
| French | Cassel | fr |
| frp | Kassel | frp |
| frr | Kassel | frr |
| fur | Kassel | fur |
| Western Frisian | Kassel | fy |
| Irish | Kassel | ga |
| Scottish Gaelic | Kassel | gd |
| Galician | Kassel | gl |
| gsw | Kassel | gsw |
| Gujarati | કાસેલ | gu |
| hak | Kassel | hak |
| Hebrew | קאסל | he |
| Hindi | कसेल | hi |
| Croatian | Kassel | hr |
| Upper Sorbian | Kassel | hsb |
| Hungarian | Kassel | hu |
| Armenian | Կասել | hy |
| Interlingua (International Auxiliary Language Association) | Kassel | ia |
| Indonesian | Kassel | id |
| Interlingue | Kassel | ie |
| Ido | Kassel | io |
| Icelandic | Kassel | is |
| Italian | Kassel | it |
| Japanese | カッセル | ja |
| Javanese | Kassel | jv |
| Georgian | კასელი | ka |
| Kongo | Kassel | kg |
| Kazakh | Кассель | kk |
| Kannada | ಕ್ಯಾಸೆಲ್ | kn |
| Korean | 카셀 | ko |
| Kurdish | Kassel | ku |
| Kirghiz | Кассель | ky |
| Latin | Cassala | la |
| Luxembourgish | Kassel | lb |
| Limburgan | Kassel | li |
| lij | Kassel | lij |
| lld | Kassel | lld |
| Lithuanian | Kaselis | lt |
| Latvian | Kasele | lv |
| mdf | Кассэль | mdf |
| Malagasy | Kassel | mg |
| min | Kassel | min |
| Macedonian | Касел | mk |
| Malayalam | കാസ്സെൽ | ml |
| Marathi | कासेल | mr |
| Malay (macrolanguage) | Kassel | ms |
| Maltese | Kassel | mt |
| nan | Kassel | nan |
| nap | Kassel | nap |
| Norwegian Bokmål | Kassel | nb |
| Low German | Kassel | nds |
| nds-nl | Kassel | nds-nl |
| Dutch | Kassel | nl |
| Norwegian Nynorsk | Kassel | nn |
| Narom | Kassel | nrm |
| Occitan (post 1500) | Kassel | oc |
| Ossetian | Кассель | os |
| Pampanga | Kassel | pam |
| pcd | Kassel | pcd |
| Polish | Kassel | pl |
| pms | Kassel | pms |
| pnb | کیسل | pnb |
| Portuguese | Kassel | pt |
| pt-br | Kassel | pt-br |
| Romansh | Kassel | rm |
| Romanian | Kassel | ro |
| Russian | Кассель | ru |
| Sardinian | Kassel | sc |
| Sicilian | Kassel | scn |
| Scots | Kassel | sco |
| Sindhi | ڪاسل | sd |
| sh | Kassel | sh |
| Sinhala | කැසෙල් | si |
| Slovak | Kassel | sk |
| Slovenian | Kassel | sl |
| Albanian | Kaseli | sq |
| Serbian | Касел | sr |
| sr-el | Kassel | sr-el |
| stq | Kassel | stq |
| Swedish | Kassel | sv |
| Swahili (macrolanguage) | Kassel | sw |
| szl | Kassel | szl |
| Tamil | கஸ்செல் | ta |
| Telugu | కాసెల్ | te |
| Tajik | Кассел | tg |
| Thai | คัสเซิล | th |
| Turkish | Kassel | tr |
| Tatar | Кассел | tt |
| tum | Kassel | tum |
| Ukrainian | Кассель | uk |
| Urdu | کاسیل | ur |
| Uzbek | Kassel | uz |
| vec | Kassel | vec |
| vep | Kassel' | vep |
| Vietnamese | Kassel | vi |
| vls | Kassel | vls |
| Volapük | Kassel | vo |
| Walloon | Kassel | wa |
| war | Kassel | war |
| Wolof | Kassel | wo |
| Wu Chinese | 卡塞尔市 | wuu |
| yue | 卡素 | yue |
| Chinese | 卡塞尔 | zh |
| zh-cn | 卡塞尔 | zh-cn |
| zh-hans | 卡塞尔 | zh-hans |
| zh-hant | 卡瑟爾 | zh-hant |
| zh-hk | 卡瑟爾 | zh-hk |
| zh-mo | 卡瑟爾 | zh-mo |
| zh-my | 卡塞尔 | zh-my |
| zh-sg | 卡塞尔 | zh-sg |
| zh-tw | 卡瑟爾 | zh-tw |
| Zulu | Kassel | zu |