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.