Ferdinand III (German: Ferdinand Josef Johann Baptist; Italian: Ferdinando Giuseppe Giovanni Baptista; English: Ferdinand Joseph John Baptist; 6 May 1769 – 18 June 1824) was Grand Duke of Tuscany from 1790 to 1801 and, after a period of disenfranchisement, again from 1814 to 1824.
He was also the Prince-elector and Grand Duke of Salzburg (1803–1805) and Grand Duke of Würzburg (1805–1814).