Lange (13 October 1863 – 15 January 1943) was a Danish librarian and egyptologist.

He expressed interest in hieroglyphics as a young man.

He became Chief Librarian at the Royal Danish Library in 1901 and served in that role through 1924.

[1] He showed great interest in incunabula and increased the library's collection in that area during his tenure.

In 1918 he received an Honorary Doctorate from Lund University.