While he is primarily known for Esperanto, he also wrote:
* "Fundamento de Esperanto" (1887): The first book describing the language.
* "Doktoro Esperanto" (1907): A utopian novel that explores themes of peace and universal understanding through Esperanto.
* "La Unua Libro" (1908): A children's book written in Esperanto.
* "Lingvo Internacia" (1887): An essay advocating for a universal language.
* "La Idea de Esperanto" (1919): A philosophical essay discussing the role of language in shaping society.
* "Progresado" (1921): A collection of essays and articles.
* "La Nacia Paco" (1919): A collection of essays about the importance of peace and internationalism.
Zamenhof was a prolific writer, and he published many articles, essays, and books advocating for Esperanto and its potential to bring about a more peaceful and harmonious world.