Giuseppe Diamantini (1621–11 November, 1705) was an Italian painter and printmaker of the Baroque period, active mainly in Venice. Some sources cite varying dates for his life span including 1660-1722.
He was born in Fossombrone. His early training is not well documented, but he arrived in Venice by c. 1650. He is appears to have been a pupil or follower of Carracci.
He is known to have designed the title page of a libretto for the opera L’inganno riconosciuto by Camillo Contarini from 1666. He reputedly was an early mentor of Rosalba Carriera, and a painter by the name of Santo Piati. He painted a God the Father on the ceiling of the choir of the church of San Giovanni Crisostomo in Venice. He painted an altarpiece of the Adoration of the Magi for the church of San Moisè. He painted classical scenes of the gods Mercury and Argus, Juno, Jupiter and Io and Venus for the hall of the Palazzo Badoer (not to be confused with the villa) in Venice. He also produced a series of about 60 prints, mainly on classical mythological subjects. In 1698, Diamantini returned to Fossombrone, where he died.
He left a considerable number of plates, most of them etchings. Among his prints are: