Wilhelm Michael Anton Creizenach (4 June 1851 – 13 May 1919) was a German historian and librarian.

He was the son of Theodore (1818–1877), poet, Hebraist, a prominent expert on work of Goethe, and Luise Flerscheim.

In 1873 he received his doctorate in Leipzig (for work on Judas Iscariot in Sage und Legende des Mittelalters).

In 1879 after the presentation of work titled zur Entstehungsgeschichte des deutschen neueren Lustspiels, was an assistant professor in the Department of General History of Literature at the University of Leipzig, he taught modern literature, for a time worked as an assistant at the National Library in Paris.

Contributed to the creation of the Department of Romance Philology at the Jagiellonian University (1890) and founded the seminary library Germanistycznego.