Karl Borromäus Vincenz Franz, Freiherr von und zu Franckenstein[a] (22 January 1831 – 2 February 1898) was an Austro-Hungarian diplomat.
After his father's death in 1845, his elder brother, Georg Arbogast von Franckenstein, took over management of the family estates.
[3] As a diplomat of the Austrian Empire, Baron von Franckenstein served as legation secretary for the Federal Presidential Envoy in Frankfurt.
[5] Franckenstein then served as Envoy Extraordinary and Minister Plenipotentiary to the Kingdom of Saxony in Dresden from 1872 to 1879 and in Copenhagen from 1880 to 1888.
[4] In Würzburg in 1872, Baron von Franckenstein was married to Sophie Elena Marie "Elma", Countess von Schönborn-Wiesentheid (1841–1884), a daughter of Klemens, 3rd Count of Schönborn-Wiesentheid (which was mediatised to Bavaria in 1806) and Irene, Countess Batthyány de Német-Ujvár.