Giovanni Faustini (1615 – 19 December 1651) was an Italian librettist and opera impresario of the 17th century.
A typical Faustini plot relies not on myth or classical history but upon his own imagination.
He based his creative thinking upon a fundamental pattern of two pair of aristocratic lovers from exotic nations, who undergo a lengthy process of separation and reconciliation, assisted by a good number of clownish servants who provide comic relief.
Many devices from Roman comedy and the pastoral genre also appear, such as sleeping potions and letters delivered to the wrong person.
Faustini was heavily committed to his career as a professional librettist, and his work with Cavalli was of vital importance in the development of Venetian opera.