Esperanto 世界语
（重定向自Esparanto）
![](/Images/godic/202501/11/Flag_of_Esperanto.svg0832.png")
![The first Esperanto book by L. L. Zamenhof.](/Images/godic/202501/11/Unua_Libro0832.jpg")
![Map of Esperanto groups in Europe in 1905.](/Images/godic/202501/11/1905-03-ge-frankf-mapo0832.jpg")
![7th Esperanto congress, Antwerp August 1911.](/Images/godic/202501/11/1911_Anvers_Congrès_Esperanto0832.jpg")
Esperanto (/ˌɛspəˈræntoʊ/ or /-ˈrɑː-/; [espeˈranto] listen ) is a constructed international auxiliary language. It is the most widely spoken constructed language in the world. The Polish ophthalmologist L. L. Zamenhof published the first book detailing Esperanto, the Unua Libro, on 26 July 1887. The name of Esperanto derives from Doktoro Esperanto ("Esperanto" translates as "one who hopes"), the pseudonym under which Zamenhof published Unua Libro.