Hans Leo Przibram ([ˈpʃɪbram]; 7 July 1874 – 20 May 1944) was an Austrian biologist who founded the biological laboratory in Vienna.

In 1902, together with the botanists Leopold von Portheim and Wilhelm Figdor, Hans Przibram bought the "Vivarium" in the Vienna Prater and set up a private research institute for experimental biology, the "Biologische Versuchsanstalt" (BVA), which opened in the following year.

Hans Przibam was also unable to continue his work as Head of the Department of Biological Research at the Academy of Sciences in Vienna, where he had been practicing for 35 years.

The new head of the BVA, NSDAP member Franz Köck, in 1939 also reported Przibam to the Property Transaction Office, and subsequently confiscated his assets.

Science historian Igor Popov has noted that Przibram "rejected both the transformation of one species into another and the existence of genealogical trees.