Prince Karl Alfred of Liechtenstein (Karl Alfred Maria Johannes Baptista Heinrich Aloys Georg Hartmann Ignatius; 16 August 1910 – 17 November 1985) was a Liechtensteiner prince and brother of Franz Joseph II. He was the third child and second son of Prince Aloys of Liechtenstein and Archduchess Elisabeth Amalie of Austria. He married on 17 February 1949, at Persenbeug Castle in Austria, Archduchess Agnes Christina of Austria (14 December 1928 – 31 August 2007). She was the second child and eldest daughter of Archduke Hubert Salvator of Austria and Princess Rosemary of Salm-Salm.