Johann Carl Megerle von Mühlfeld (1765 – 12 September 1840) was an Austrian naturalist who served as the first curator of insects at the Imperial Natural History Cabinet in Vienna.
He was a brother of Johann Georg Megerle von Mühlfeld.
He worked at the cabinet from 1786 in an honorary position along with Andreas Xaverius Stütz and in 1792 he became a custodian for the mineral collection.
From 1798 to 1806 he was involved in trading natural history specimens at the Bürgerspital.
[2][3] Among the taxa Mergerle von Mühlfeld described are: The brachiopod genus Megerlia King, 1850 is named after him, as well as the odostomiine snail species Odostomia megerlei Locard, 1886.