Diodata Malvasia (c. 1532 - post-1617) was a nun within the convent of San Mattia in Bologna, Italy. She lived during the period of ecclesiastical reform that arose from the Council of Trent. She is known for being a prolific author, having published Brief Discourse on What Occurred to the Most Reverend Sisters of the Joined Convents of San Mattia and San Luca from the year 1573 (1575) and The Arrival and the Miraculous Workings of the Glorious Image of the Virgin Painted by Saint Luke (1617), and for having been involved in other literary works of her time.