Esperanto capitalizes proper names and sentence beginnings, but it does not have one compulsory title-case code comparable to a major English style manual. A sound default is sentence-style capitalization for the title of a work and initial capitals for the meaningful words inside a multiword proper name. Function words usually remain lowercase unless they begin the title or form an official part of the name.
The key is to distinguish grammar from typography. Maro may be capitalized inside the proper name Nigra Maro, while the same noun is lowercase in nigra maro, “a black sea.” Case can show naming status in writing, but it never changes a letter’s pronunciation.
For the broader case system beyond names and titles, begin with uppercase and lowercase.
Titles of works: begin like a sentence
For books, articles, talks, films, and similar works, sentence-style capitalization is the safest international convention: capitalize the first word and any genuine proper names. Do not automatically capitalize every English “important word.”
Mi ĵus legis ‘Vojaĝo tra la norda Italio’.
I have just read ‘A Journey through Northern Italy.’
Vojaĝo is capitalized because it begins the title; Italio is capitalized because it is a proper name. The adjective norda remains lowercase.
La hodiaŭa prelego nomiĝas ‘Kiel lerni Esperanton per ĉiutaga praktikado’.
Today’s lecture is called ‘How to Learn Esperanto through Daily Practice.’
English title case might capitalize Learn, Esperanto, Daily, and Practice. Esperanto needs only the initial word and the proper name Esperanto.
Ĉu vi vidis la filmon ‘La lasta trajno al Parizo’?
Have you seen the film ‘The Last Train to Paris’?
An initial article belongs to the title and is capitalized because it comes first. The preposition al stays lowercase.
Some publishers capitalize more words. That is (editorial variation), not a change in Esperanto grammar. Within one book, website, or journal, choose a pattern and apply it consistently.
Multiword proper names
In names consisting of several Esperanto words, it is common to capitalize the first word and other meaning-bearing nouns or adjectives. Short grammatical words such as de, pri, ĉe, kaj commonly remain lowercase unless they begin the name.
La Nigra Maro situas inter Eŭropo kaj Azio.
The Black Sea lies between Europe and Asia.
Ŝi laboras por la Departemento pri Eksterlandaj Aferoj.
She works for the Department of Foreign Affairs.
La Universala Deklaracio de Homaj Rajtoj aperis en multaj lingvoj.
The Universal Declaration of Human Rights has appeared in many languages.
Capitalization helps the reader see that these expressions function as names. Compare the minimal contrast:
Post la ŝtormo la nigra maro aspektis minaca, sed la Nigra Maro restis malproksime.
After the storm the black sea looked threatening, but the Black Sea remained far away.
The spoken forms are identical; only context and written case separate the description nigra maro from the geographical name Nigra Maro.
Personal names and name particles
Esperantized personal names take an initial capital: Ludoviko Zamenhof, Vilhelmo Ŝekspiro, Konfuceo. A name retained in its original spelling generally retains its own spelling and capitalization, even if it contains letters outside the Esperanto alphabet. Do not “correct” another person’s chosen spelling merely to make it look Esperanto-like.
Morgaŭ ni diskutos leteron de Ludoviko Zamenhof.
Tomorrow we will discuss a letter by Ludwik Zamenhof.
Particles such as de, van, von, or al- belong to particular naming traditions. Their case is not predicted by Esperanto grammar; preserve the established form or the bearer’s preference. When a fully Esperantized form is conventional, follow that recorded form consistently.
Offices, honorifics, and ordinary descriptions
An office or honorific used as an ordinary description is normally lowercase: prezidanto, profesoro, doktoro, sinjorino. Capitalize it when it begins a sentence or when a particular institution’s official title or document style treats it as part of a formal name.
La prezidanto Ana Ribeiro malfermis la kunvenon.
President Ana Ribeiro opened the meeting.
Profesoro Ŝulco, ĉu vi havas momenton?
Professor Ŝulco, do you have a moment?
In the second example, Profesoro begins the sentence and direct address. Mid-sentence, Mi demandis profesoron Ŝulco would not need a capital on the occupational noun.
Names of organizations follow their adopted form. A general description remains lowercase:
La loka Esperanto-klubo kunlaboras kun Universala Esperanto-Asocio.
The local Esperanto club works with the Universal Esperanto Association.
The first phrase describes a type of club; the second is an organization’s name.
Derivatives of names
Most lowercase-leaning modern usage writes ordinary derivatives of proper names in lowercase: Eŭropo → eŭropa, Zamenhof → zamenhofa, Kanado → kanada. Capitalized derivatives also occur, especially when clarity or an editorial tradition favors them.
La ekspozicio prezentas zamenhofajn manuskriptojn kaj modernajn eŭropajn revuojn.
The exhibition presents Zamenhofian manuscripts and modern European magazines.
The especially useful contrast esperanta/Esperanta deserves care. Lowercase esperanta can mean either “Esperanto-related” or the participle “hoping”; uppercase Esperanta can make the language-related meaning explicit.
La esperanta kandidato atendis bonan novaĵon; la Esperanta kandidato parolis pri lingvopolitiko.
The hopeful candidate awaited good news; the Esperanto candidate spoke about language policy.
This distinction is available in writing, but it is not pronounced. Context must still carry the contrast in speech.
Diacritic capitals and input systems
The uppercase partners of ĉ, ĝ, ĥ, ĵ, ŝ, ŭ are Ĉ, Ĝ, Ĥ, Ĵ, Ŝ, Ŭ. Capitalization never licenses dropping a diacritic.
Ĝoja loĝas en Ĥarkivo, kaj Ŝimon studas en Eŭropo.
Ĝoja lives in Kharkiv, and Ŝimon studies in Europe.
Use Unicode in finished prose. The h-system is a (Fundamental fallback), and the x-system is a (technical input convention); software may turn Gx into Ĝ or Sx into Ŝ. Converter case rules vary, so inspect the output rather than publishing raw codes.
La redaktilo konvertis la provizoran formon ‘Sximono’ al ‘Ŝimono’.
The editor converted the temporary x-system form Sximono to Ŝimono.
A short editorial exchange
— Ĉu ĉiuj vortoj en la titolo bezonas majusklon? — Ne; ni uzas frazstilan majuskladon.
— Does every word in the title need a capital? — No; we use sentence-style capitalization.
This is a house-style answer, not a claim that every differently styled historical text is ungrammatical.
Common Mistakes
1. Copying English headline capitalization. Esperanto does not automatically capitalize every major title word.
❌ La Sekreto De La Malnova Domo
Poor default style — English-style capitals have been copied into every content word.
✅ La sekreto de la malnova domo
The secret of the old house.
2. Lowercasing a real proper name. Descriptions and names can contrast.
❌ Ni velis sur la nigra maro apud Bulgario.
Incorrect for the geographical name — nigra maro is merely a description.
✅ Ni velis sur la Nigra Maro apud Bulgario.
We sailed on the Black Sea near Bulgaria.
3. Capitalizing national adjectives by English habit. Lowercase is the common modern convention.
❌ Ŝi verkis Kanadan romanon.
Nonstandard in this guide’s style — mechanically copying English capitalization.
✅ Ŝi verkis kanadan romanon.
She wrote a Canadian novel.
4. Removing marks from capital letters. Diacritics are part of letter identity.
❌ GARDENO CE LA STACIO
Incorrect — the intended Ĝ and Ĉ have lost their diacritics.
✅ ĜARDENO ĈE LA STACIO
GARDEN BY THE STATION.
5. Treating x-system input as a finished name. Convert the code to Unicode.
❌ La afiŝo anoncas koncerton de Jxenja.
Incorrect as finished Unicode prose — the name still contains an x-system code.
✅ La afiŝo anoncas koncerton de Ĵenja.
The poster announces a concert by Ĵenja.
Key Takeaways
Use sentence-style capitalization for titles unless a house style says otherwise. Capitalize proper names and the salient words of multiword names, usually leaving internal function words lowercase. Preserve people’s established name forms, keep ordinary offices and derivatives lowercase by default, and never sacrifice an Esperanto diacritic when changing case.
Related Topics
- Uppercase and LowercaseA2 — Use Esperanto letter case for sentences and names while recognizing genuine variation in derived names, months, respect, and editorial style.
- Foreign Names in EsperantoA2 — How to choose among full adaptation, partial adaptation, and original spelling while keeping names recognizable and usable.
- Word Boundaries and HyphensA2 — Learn when Esperanto writes elements together, separately, or with an optional hyphen, and how spacing reveals grammatical structure.
- Proper NamesA2 — How Esperanto proper names behave as definite noun phrases, take case and number, and interact with articles and titles.
- Names, Titles, and Honorific NounsB1 — How personal names combine with regular Esperanto title nouns, articles, number, case, and direct address.
- Accepted Variation and Personal StyleC2 — Distinguish stable grammar, accepted alternatives, register choices, individual style, and genuinely nonstandard forms in Esperanto.