| Part of speech | proper name |
|---|---|
| Hyphenation | Da·nub·o |
| Nominative | Danubo |
|---|---|
| Accusative | Danubon |
| Afrikaans | Donau |
|---|---|
| Albanian | Danub |
| Catalan | Danubi |
| Czech | Dunaj |
| Danish | Donau |
| Dutch | Donau |
| English | Danube; Danube River |
| Faeroese | Donau |
| Finnish | Tonava |
| French | Danube |
| German | Donau |
| Greek | Δούναβης |
| Hungarian | Duna |
| Icelandic | Dóná |
| Italian | Danubio |
| Latin | Danubius; Danuvius; Hister |
| Norwegian | Donau |
| Polish | Dunaj |
| Portuguese | Danúbio |
| Romanian | Dunăre |
| Russian | Дунай |
| Saterland Frisian | Donau |
| Spanish | Danubio |
| Swahili | Danubi |
| Swedish | Donau |
| Thai | แม่น้ำดานูบ |
| Turkish | Tuna nehri |
| Welsh | Afon Donaw; Donaw |
| West Frisian | Donau |