Wilhelm August Streitberg (23 February 1864, in Rüdesheim am Rhein – 19 August 1925, in Leipzig) was a German Indo-Europeanist, specializing in Germanic languages. Together with Karl Brugmann he founded the Indogermanische Forschungen journal.
He studied Germanistics and Indo-European philology at Münster Academy and at the universities of Berlin and Leipzig, receiving his habilitation for Indo-European linguistics at Münster in 1889. In 1906 he became a full professor, and three years later relocated to the University of Munich as a professor of Indo-European linguistics. In 1920 he returned to Leipzig, where he taught classes up until his death in 1925. From 1911 to 1920 he was a member of the Bavarian Academy of Sciences.
- 1896 Urgermanische Grammatik.
- 1897 Gotisches Elementarbuch. (2nd edition 1906, 3rd and 4th editions 1910, 5th and 6th editions 1920).
- 1908 Die gotische Bibel (as editor).