Markus von Jabornegg zu Gamsenegg und Moderndorf (17 March 1837, Klagenfurt - 6 May 1910, Klagenfurt) was an Austrian government official and botanist.
Following graduation from the Theresian Military Academy, he was sent as a Regimentskadett to Pressburg. Later, he was stationed in Galicia, Hungary, Graz, Vienna and Italy. From 1859 he was based in Carinthia, where he was eventually appointed Landeskanzleidirektor (1876).[1]
He was a catalyst in the development of the botanical garden in Klagenfurt, serving as its director from 1871 to 1909.[1] From 1901 to 1910, he was president of the natural history museum of Carinthia,[2] and for a period of time served as president of the Kärntner Gartenbauvereins (Carinthian Horticultural Society). Also, he taught classes at the Gartenbauschule (school of horticulture) in Klagenfurt.[1]
With David Pacher, he collaborated on Flora von Kärnten, a work involving Carinthian flora that was issued from 1881 to 1894.[3] From 1875 to 1892, he was an editor of the magazine Carinthia.[1]