Archduke Karl Ferdinand of Austria (Vienna, 29 July 1818 – Gross Seelowitz (Židlochovice Castle), 20 November 1874) was the second son of Archduke Charles, Duke of Teschen (1771–1847) and Princess Henrietta of Nassau-Weilburg, and the maternal grandfather of King Alfonso XIII of Spain.
A son of the "hero of Aspern" he started a military career in Infantry Regiment 57 in Brno.
Later he received command of a brigade in Italy and fought against the insurgents in Prague in 1848.
In 1859 he was a general in Moravia and Silesia and returned to Brno in 1860.
He became a Lieutenant Field Marshal of the Austrian Army.