WBaron Christoph Freiherr Fellner von Feldegg was an Austrian army officer and naturalist.
WCarl Eduard Hellmayr was an Austrian ornithologist.
WJoseph "Krystel" Franz Freiherr von Jacquin or Baron Joseph von Jacquin was an Austrian scientist who studied medicine, chemistry, zoology and botany. The standard author abbreviation J.Jacq. is used to indicate this person as the author when citing a botanical name.
WNikolaus Joseph Freiherr von Jacquin was a scientist who studied medicine, chemistry and botany.
WKonrad Zacharias Lorenz was an Austrian zoologist, ethologist, and ornithologist. He shared the 1973 Nobel Prize in Physiology or Medicine with Nikolaas Tinbergen and Karl von Frisch. He is often regarded as one of the founders of modern ethology, the study of animal behavior. He developed an approach that began with an earlier generation, including his teacher Oskar Heinroth.
WAugust von Pelzeln was an Austrian ornithologist. He was a grandson to novelist Karoline Pichler (1769-1843).
WAndreas Reischek was an Austrian taxidermist, naturalist, ornithologist and collector notable for his extensive natural history collecting expeditions throughout New Zealand as well as being notorious for acts of grave robbing there. He added materially to the understanding of the biology and distribution of the New Zealand avifauna.
WOthmar Reiser or Otmar Rajzer was an Austro-Slovenian ornithologist and naturalist who worked as curator of the bird collections in the natural history museum at Sarajevo, working there from its foundation for thirty-three years during which he explored various regions including the Balkans and South America and collecting specimens for the museum. Several species are named after him based on his specimens.
WGiovanni Antonio Scopoli was an Austrian physician and naturalist. His biographer Otto Guglia named him the "first anational European" and the "Linnaeus of the Austrian Empire".
WFerdinand Stoliczka was a Moravian palaeontologist who worked in India on paleontology, geology and various aspects of zoology, including ornithology, malacology, and herpetology. He died of high altitude sickness in Murgo during an expedition across the Himalayas.
WViktor von Tschusi zu Schmidhoffen was an Austrian ornithologist.