Johannes Frischauf (17 September 1837 in Vienna – 7 January 1924 in Graz) was an Austrian mathematician, physicist, astronomer, geodesist and alpinist.

Starting in 1863, he was professor at the University of Graz for pure and applied mathematics.

[1][2][3][4][5] Starting with 1868, Frischauf pioneered the touristic development of the Sannthaler and Steiner Alps by opening ways and huts.

Together with Franz von Juraschek and Mathias Spreiz he was the first to climb the Admonter Reichenstein.

Frischauf's Funerary urn was placed on the Scheichenspitze in the Dachstein Mountains.