Archduke Franz Karl of Austria

Archduke Franz Karl Joseph of Austria (17 December 1802 – 8 March 1878) was a member of the House of Habsburg-Lorraine.

Franz 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. Franz Ferdinand's assassination sparked the hostilities that led to the outbreak of World War I. Karl Joseph was the great-grandfather of the last Habsburg emperor Karl I.