| Part of speech | common noun |
|---|---|
| Gender | neuter |
| Singular | Plural | |
|---|---|---|
| Nominative | Herzogtum | Herzogtümer |
| Genitive | Herzogtums | Herzogtümer |
| Dative | Herzogtum | Herzogtümern |
| Accusative | Herzogtum | Herzogtümer |
| Afrikaans | hertogdom |
|---|---|
| Catalan | ducat |
| Czech | vévodství |
| Danish | hertugdomme |
| Dutch | hertogdom |
| English | duchy |
| Esperanto | duklando |
| French | duché |
| Low German | hartogdom |
| Portuguese | ducado |
| Saterland Frisian | Härtsochdum |
| Spanish | ducado |
| Swedish | hertigdöme |
| Welsh | dugiaeth |
| West Frisian | hartochdom |