Ferdinando I
Grand Duke of Tuscany
Predecessor	Francesco I
Successor	Cosimo II
Born	(1549-07-30)30 July 1549 Palazzo Pitti, Florence
Died	3 February 1609(1609-02-03) (aged 59) Palazzo Pitti, Florence
Spouse	Christina of Lorraine
Issue	Cosimo II, Grand Duke of Tuscany Princess Maria Maddalena Caterina, Duchess of Mantua Carlo, Bishop of Ostia Claudia, Archduchess of Austria
Full name Ferdinando de' Medici
House	House of Medici
Father	Grand Duke Cosimo I of Tuscany
Mother	Eleonora di Toledo

Ferdinando I de' Medici, Grand Duke of Tuscany (30 July 1549 – 3 February 1609) was Grand Duke of Tuscany from 1587 to 1609. He succeeded his older brother Francesco I.

Ferdinando was the fifth son of Cosimo I de' Medici, Grand Duke of Tuscany and Eleonora di Toledo.

He was a Cardinal before he became Grand Duke, until he married Christine of Lorraine in 1589. He was succeeded by his eldest son, who reigned as Cosimo II. His wife and daughter-in-law Maria Maddalena of Austria acted as regents for Cosimo II.

• Cosimo II de' Medici, Grand Duke of Tuscany (1590–1621); married Maria Maddalena of Austria and had issue;
• Eleonora de' Medici (1591–1617) died unmarried
• Catherine de' Medici (1593–1629); married Ferdinando Gonzaga, Duke of Mantua, later Governor of Siena;
• Francesco de' Medici (1594–1614) died unmarried;
• Carlo de' Medici (1595–1666) died unmarried;
• Filippino de' Medici (1598–1602) died unmarried;
• Lorenzo de' Medici (1599–1648) died unmarried;
• Maria Maddalena de' Medici (1600–1633) died unmarried;
• Claudia de' Medici (1604–1648); married (1) Federico della Rovere and had issue; (2) Leopold V, Archduke of Austria and had issue.