Aron Freimann (5 August 1871 at Filehne, Posen – 6 June 1948 at New York City) was a German librarian and historian. He was the son of Israel Meïr Freimann, and grandson, on his mother's side, of the chief rabbi of Altona, Jacob Ettlinger. He attended the Royal Gymnasium of Ostrowo (his father was the town's Jewish congregation rabbi) and in 1893 entered the University of Berlin (Ph. D., 1896), where he studied history and Oriental languages, devoting himself at the same time to the study of archival and library systems. Parallelly he took courses at the Rabbinical Seminary at Berlin.