| Language | Name | Code |
|---|---|---|
| Belarusian | Каслбар | be |
| Bulgarian | Касълбар | bg |
| Breton | Caisleán an Bharraigh | br |
| Catalan | Castlebar | ca |
| Cebuano | Castlebar (kapital sa kondado sa Ireland) | ceb |
| Czech | Castlebar | cs |
| Welsh | Castlebar | cy |
| Danish | Castlebar | da |
| German | Castlebar | de |
| Modern Greek (1453-) | Κάσλμπαρ | el |
| English | Castlebar | en |
| en-us | Castlebar | en-us |
| Esperanto | Castlebar | eo |
| Spanish | Castlebar | es |
| Basque | Castlebar | eu |
| Persian | کسلبار | fa |
| Faroese | Castlebar | fo |
| French | Castlebar | fr |
| frr | Castlebar | frr |
| Irish | Caisleán an Bharraigh | ga |
| Scottish Gaelic | Caisleán an Bharraigh | gd |
| Galician | Castlebar | gl |
| Hebrew | קאסטלבר | he |
| Hungarian | Castlebar | hu |
| Armenian | Կասլբար | hy |
| Indonesian | Castlebar | id |
| Italian | Castlebar | it |
| Japanese | カスルバー | ja |
| Georgian | კასლბარი | ka |
| Korean | 캐슬바 | ko |
| Luxembourgish | Castlebar | lb |
| Lithuanian | Kaslbaras | lt |
| Latvian | Kāslbāra | lv |
| Norwegian Bokmål | Castlebar | nb |
| Dutch | Castlebar | nl |
| Norwegian Nynorsk | Castlebar | nn |
| Polish | Castlebar | pl |
| Portuguese | Castlebar | pt |
| Russian | Каслбар | ru |
| Slovenian | Castlebar | sl |
| Serbian | Каслбар | sr |
| sr-ec | Каслбар | sr-ec |
| sr-el | Kaslbar | sr-el |
| Swedish | Castlebar | sv |
| Swahili (macrolanguage) | Castlebar | sw |
| Ukrainian | Каслбар | uk |
| Urdu | کیسلبار | ur |
| Chinese | 卡斯尔巴 | zh |