Laura Dianti (Early sixteenth century in Ferrara â 25 June 1573 in Ferrara, Italy) was an Italian woman. She was a lover and possible third wife of Alfonso I d'Este, Duke of Ferrara.
Laura Dianti was born the daughter of Francesco Boccacci Dianti (d. 1542). She became a mistress of Alfonso I d'Este, Duke of Ferrara (1476-1534) after the death of his second wife, Lucrezia Borgia, daughter of Pope Alexander VI. Laura was most probably his third wife. She was also known under the pseudonym Eustochia.
The couple had two sons: