thumb|Reading room in the 1960sThe '''Hector Hodler Library''' is one of the largest Esperanto libraries,<ref>{{cite web |title=The Hector Hodler Library |url=https://www.esperantic.org/en/research/research-tools/the-hector-hodler-library/ |website=Esperantic Studies Foundation |access-date=23 July 2025}}</ref> with approximately 30,000 books in addition to periodicals, manuscripts, photos, music, and other collections. It occupied three rooms in the central office of the Universal Esperanto Association (UEA) in Rotterdam, Netherlands, but the main part was transferred to the National Library of Polland (''Biblioteka Narodowa'') in Warsaw in 2023<ref>(eo) [https://www.esperantio.net/heko/biblioteko-hodler-definitive-en-varsovio Biblioteko Hodler definitive en Varsovio], HeKo, HeKo 812 5-A, 21 may 2023</ref>. This library is among the three most important collections in the world specializing in literature in and about the international planned language Esperanto<ref>(en) [https://www.esperantic.org/en/research/research-tools/the-hector-hodler-library/ The Hector Hodler Library], ESF, 2023</ref>.
== History == thumb|Archive in 2006 The Swiss Esperanto Society opened the library in Switzerland in 1908. In 1912, the library came into the possession of Hector Hodler, the founder of UEA, and after Hodler's death in 1920 the library remained under the management of UEA in Switzerland. In 1947, the library was renamed the Hector Hodler Library, and when UEA headquarters relocated to Rotterdam, the library was moved there in 1960.
By 2004, the library held over 15,000 volumes.<ref>{{Cite news |date=2004-01-31 |title=Esperanto: Wants to be everyone's second language |url=https://www.newspapers.com/article/the-ottawa-citizen-esperanto-wants-to-b/140035243/ |access-date=2024-02-01 |work=The Ottawa Citizen |pages=18 |via=Newspapers.com}}</ref>
Other major collections of Esperanto literature are at
* International Esperanto Museum, part of the Austrian National Library,
* Montagu C. Butler Library, Britain * Center for Documentation and Study about the International Language, * Hendrik Conscience Heritage Library (''Erfgoedbibliotheek H. Conscience'') in Belgium<ref>[https://mailchi.mp/21c0ad7da7f7/newsletter-hendrik-conscience-heritage-library-1320417?e=9e8247c617 The Esperanto collection of the Hendrik Conscience Heritage Library], 2020, Newsletter for Researchers, Antwerp.</ref> <ref>(en) ''[https://consciencebibliotheek.be/en/page/esperanto-collection-hendrik-conscience-heritage-library The Esperanto collection of the Hendrik Conscience Heritage Library]'', Hendrik Conscience Heritage Library.</ref> {{Portal|Constructed languages }} == See also == * Esperanto library * Esperanto archive
== References == {{reflist}}{{Commons category|Biblioteko Hector Hodler}} == External links == * [https://web.archive.org/web/20120303025825/http://dok.esperantic.org/ced/hodler.htm About the library]
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Category:Libraries in the Netherlands Category:Esperanto libraries Category:Buildings and structures in Rotterdam Category:Education in South Holland Category:Esperanto in the Netherlands Category:Libraries established in 1908
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