| Archduke Franz Karl | |||||
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 Franz Karl in the uniform of an Austrian field marshal, 1839. | |||||
| Born | 17 December 1802 Vienna, Archduchy of Austria, Holy Roman Empire | ||||
| Died | 8 March 1878 (aged 75) Vienna, Austria-Hungary | ||||
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| House | Habsburg-Lorraine | ||||
| Father | Francis II, Holy Roman Emperor | ||||
| Mother | Princess Maria Theresa of Naples and Sicily | ||||
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| Styles of Archduke Franz Carl of Austria | |
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| Reference style | His Imperial and Royal Highness |
| Spoken style | Your Imperial and Royal Highness |
Archduke Franz Karl Joseph of Austria (17 December 1802 – 8 March 1878) was a member of the House of Habsburg-Lorraine. He was the father of two emperors: Franz Joseph I of Austria and Maximilian I of Mexico. Through his third son Karl Ludwig, he was the grandfather of Archduke Franz Ferdinand of Austria – whose assassination sparked the hostilities that led to the outbreak of World War I.