Ferdinand I (19 April 1793 – 29 June 1875) was Emperor of Austria, President of the German Confederation, King of Hungary, Croatia, and Bohemia (as Ferdinand V), as well as associated dominions from the death of his father (Francis II, Holy Roman Emperor) on 2 March 1835, until his abdication after the Revolutions of 1848.

He married Maria Anna of Savoy, the sixth child of Victor Emmanuel I of Sardinia. They had no issue. Ferdinand was incapable of ruling his empire because of his mental deficiency, so his father, before he died, drafted a will promulgating that he consult Archduke Louis on every aspect of internal policy, and urged him to be influenced by Prince Metternich, Austria's Foreign Minister.

He abdicated on December 2, 1848. He was succeeded by his nephew, Franz Joseph. Following his abdication, he lived in Hradčany Palace, Prague, until his death in 1875.

Ferdinand was the eldest son of Francis II, Holy Roman Emperor and Maria Theresa of Naples and Sicily. Possibly as a result of his parents' genetic closeness (they were double first cousins), Ferdinand suffered from epilepsy, hydrocephalus, neurological problems, and a speech impediment. He was educated by Baron Josef Kalasanz von Erberg, and his wife Josephine, née Gräfin von Attems.

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