You can help expand this article with text translated from the corresponding articles in Latvian and Russian. (July 2024) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Latvian Wikipedia article at [[:lv:Jānis Endzelīns]]; see its history for attribution. You may also add the template {{Translated|lv|Jānis Endzelīns}} to the talk page. For more guidance, see Wikipedia:Translation.

Jānis Endzelīns
Born	(1873-02-22)22 February 1873 Kauguri parish, Governorate of Livonia, Russian Empire
Died	1 July 1961(1961-07-01) (aged 88) Koknese, Latvian SSR, Soviet Union
Nationality	Latvian
Alma mater	University of Dorpat
Awards	Order of the Three Stars Order of Lenin Order of the Red Banner of Labour Order of the Red Star Order of the White Lion Order of the Lithuanian Grand Duke Gediminas

Jānis Endzelīns (22 February 1873 – 1 July 1961) was a Latvian linguist.

He graduated from the University of Tartu.^[1] In 1908, he and Kārlis Mīlenbahs developed the modern Latvian alphabet, which slowly replaced the old orthography used before.^{[citation needed]}

He was elected a foreign member of the Royal Netherlands Academy of Arts and Sciences in 1936. His son was chess master Lūcijs Endzelīns.^[2]