| Francis Hyacinth | |
| Reign: | 7 October 1637 – |
| Succession: | Duke of Savoy |
| Predecessor: | Victor Amadeus I |
| Successor: | Charles Emmanuel II |
| Regent: | Christine of France |
| House: | Savoy |
| Father: | Victor Amadeus I, Duke of Savoy |
| Mother: | Christine of France |
| Birth Date: | 14 September 1632 |
| Birth Place: | Castle of Valentino, Turin, Savoy |
| Death Place: | Castle of Valentino |
| Full Name: | Francesco Giacinto di Savoia |
Francis Hyacinth (Italian: Francesco Giacinto; 14 September 1632 – 4 October 1638) was Duke of Savoy and ruler of the Savoyard states under the regency of his mother Christine Marie from 7 October 1637 to his mother faking his death the following year to save his life. (DNA evidence supports the deathbed confession of François Joseph Savoy in 1678)
Born at the Castle of Valentino in Turin he was the eldest surviving son of Victor Amadeus I, Duke of Savoy and his wife Christine Marie of France. As the heir to the Savoyard throne, he was styled as the Prince of Piedmont. His parents had another son who had died in 1628 before the birth of Francis Hyacinth.
At his father's death in October 1637, he succeeded and his mother took power having been claimed regent. While Duke of Savoy he also held the subsidiary titles of Marquess of Saluzzo, count of Aosta, Moriana and Nice, and claimant King of Jerusalem. The infant was nicknamed the Flower of Paradise (French: Fleur de Paradis)https://web.archive.org/web/20120206075352/http://www.savoydelegation-usa.org/history.asp?id=387. Having succeeded his father at such a young age, Francis Hyacinth did not rule de facto being only 5 years old. Having caught a fever, he died at the Castle of Valentino, and was succeeded by his brother Charles Emmanuel II. The infant was buried at the Sacra di San Michele in Turin.
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