| Prince Johann Karl | |
| House: | Liechtenstein |
| Father: | Johann I Joseph |
| Mother: | Landgravine Josepha of Fürstenberg-Weitra |
| Spouse: | Rosalie d'Hemricourt, Countess of Grünne |
| Birth Place: | Vienna |
| Death Place: | Ischl |
| Full Name: | Johann Borromäus Karl Nepomuk Anton |
Prince Karl Johann of Liechtenstein (Karl Borromäus Johann Nepomuk Anton; 14 June 1803, in Vienna – 12 October 1871, in Ischl) was the third and youngest son of Johann I Joseph, Prince of Liechtenstein (1760–1836) and wife Landgravine Josepha of Fürstenberg-Weitra, nephew of Aloys I, brother of Aloys II and uncle of Johann II and Franz I.
His father, Prince Johann I, ceded governance of Lichtenstein to him when he was still a minor in 1806, according to the terms of a treaty with the Confederation of the Rhine, which dissolved in 1813.[1]
On 10 September 1832, in Graz, he married Rosalie d'Hemricourt Gräfin von Grünne (3 March 1805, in Vienna – 20 April 1841, in Freiwaldau), elder sister of Count Karl Ludwig von Grünne, daughter of Count Philipp Ferdinand von Grünne-Pinchart (1762-1854) and his wife, Baroness Rosalie van der Feltz (1779-1811). She was widow of Ludwig Johann Heinrich, Graf von Schönfeldt (20 March 1791, in Vienna – 19 August 1828, in Reitenau), and had three children: