| Archduke Karl Ferdinand | |
| Birth Date: | 29 July 1818 |
| Birth Place: | Vienna, Austrian Empire |
| Issue: |
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| Death Place: | Židlochovice Palace, Židlochovice, Moravia, Austrian Empire |
| Burial Place: | Imperial Crypt |
| House: | Habsburg-Lorraine |
| Father: | Archduke Charles, Duke of Teschen |
| Mother: | Princess Henrietta of Nassau-Weilburg |
| Religion: | Roman Catholicism |
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 his 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.
In Vienna, on 18 April 1854, Karl Ferdinand married his first cousin, Archduchess Elisabeth of Austria (1831–1903), the widow of Archduke Ferdinand of Austria-Este, the daughter of Archduke Joseph of Austria, Palatine of Hungary and the mother of Queen Maria Theresia of Bavaria.
They had six children: