Gregorio (Goro) Dati (15 April 1362 – 17 September 1435) was a Florentine merchant and diarist best known for the authorship of The Diaries of Gregorio Dati, which represents a major source for the social and economic historians of the Renaissance Florence, alongside the diaries of Buonaccorso Pitti.
He kept a detailed diary outlining his business dealings as well as personal information about the births and deaths of his four successive wives and his 26 children.