Singular vocative

Using the vocative is a core part of Czech politeness. Omitting it sounds abrupt or distinctly foreign. It is fully productive across all registers, from highly formal letters (Vážený pane...) to casual texts (Ahoj mami).

Vocative vs. Nominative:
Use the nominative subject when talking about someone (Jana je tady. = Jana is here). Use the vocative when talking to them (Jano, pojď sem! = Jana, come here!).

Adjectives in the Vocative:
Czech adjectives do not have a distinct vocative form; they simply reuse the nominative case. This is why adjectives in greetings like Vážený (Esteemed) or Milý (Dear) do not change (Vážený pane, Milá Jano).

Honorifics and Surnames:
When addressing a man by the honorific pan (vocative: pane) and his surname, both must be in the vocative (pane Nováku!). Male surnames simply follow the standard declension rules for masculine animate nouns: depending on the final consonant, they take an -u (Novák becomes Nováku), an -e (Zeman becomes Zemane), or an -i (Kolář becomes Koláři). Surnames ending in -a take an -o (Svoboda becomes Svobodo), while those ending in -e or -o remain unchanged. Because adjectives reuse the nominative, adjectival surnames ending in -ý or -í do not change in the vocative (pane Novotný!, pane Krejčí!). Be careful: while using the nominative for a standard noun surname (pane Novák!) is sometimes heard in casual or regional speech, it is considered incorrect and impolite in formal contexts. As a learner, you should always decline both. For women, the honorific paní and female surnames do not change in the vocative, regardless of their ending (paní Nováková!). Similarly, the honorific slečna (Miss) changes to slečno, but the surname remains unchanged (slečno Nováková!). For first names, most male and female names change in the vocative (Jana becomes Jano, Petr becomes Petře). For female first names ending in a consonant (e.g., Dagmar, Ester, Miriam), they are standardly left uninflected in the vocative (Dagmar!, Ester!, Miriam!). However, note that the recognized variant Dagmara correctly takes the vocative Dagmaro!.

Professional and Academic Titles:
In both spoken and formal written Czech, when addressing someone with a professional or academic title, the surname is dropped entirely. You use the honorific plus the title in the vocative (e.g., pane doktore!, paní učitelko!). Combining a title and a surname (like pane doktore Svobodo) is a classic etiquette mistake. Furthermore, Czech etiquette dictates a strict hierarchy: always address someone by their highest title, and note that a function trumps an academic title (e.g., address a school director as pane řediteli! even if he is a doctor). Finally, titles for women are feminized and declined in the vocative (e.g., paní doktorko!, paní profesorko!).