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Nikolaus von Jacquin, full name Nikolaus Joseph Freiherr von Jacquin, also Baron Nikolaus von Jacquin, was an Austrian and Dutch scientist, professor of chemistry and botany, and director of the Vienna Botanical Garden.
Jacquin is considered a pioneer of scientific botany in Austria. He wrote fundamental works in botany, was the first to describe many plants, fungi, and animals, introduced experimental methods in chemistry, and successfully campaigned for the introduction of Linnaeus' system of plants in Austria. On behalf of Emperor Franz I, von Jacquin was in charge of the imperial gardens (including Schoenbrunn) and also led a scientific expedition to Central America from 1754 to 1759, from which he returned with an extensive collection of plants.
In 1768, Nikolaus von Jacquin was appointed professor of botany and chemistry at the Faculty of Medicine of the University of Vienna and director of the newly founded botanical garden, which he reorganized according to scientific principles. Nikolaus von Jacquin was a member of the Royal Society of London, a foreign honorary member of the St. Petersburg Academy of Sciences, and a correspondent of the Paris Academy of Sciences.