Don Giovanni de' Medici (13 May 1567, in Florence – 19 July 1621, in Murano) was an Italian military commander, diplomat and architect.
Medici was born the illegitimate son of Cosimo I de' Medici, Grand Duke of Tuscany and Eleonora degli Albizzi.
He married Livia del Vernazza, with whom he had two sons; Gianfrancesco Maria (1619–1689) and another that was born posthumously but died as an infant.
Giovanni was also a painter and an architect, and collaborated with Matteo Nigetti in the design of the Cappella dei Principi for the church of San Lorenzo in Florence.
[1] Don Giovanni took special care in dealing with artists, he was an architect, he designed the construction of the Chapel of the Princes and the Church of San Lorenzo, but he also had a special relationship with the commedia dell'arte, in fact from 1612 to 1621 he oversaw relations with the comedy troupe of Confidenti, with whom he had extensive correspondence with famous comedians Flaminio Scala and Nicholas Barbieri Beltrame in art, as with other patrons such as Gonzaga and the owners of theatres in which Confidenti had to act.