Gian Benedetto Mittarelli (2 September 1707 – 14 August 1777) was an Italian abbot and monastic historian in the Camaldolese Order.
At the early age of fourteen, Nicola entered the Camaldolese Order at the Monastery of St. Michael, established on the island of Murano in the Venetian Lagoon.
Because he was not attuned to the scholastic method, his superiors sent him to the Monastery of Saint Parisius in Treviso, where he became a confessor and the archivist of the Order.
In 1760 he was elected Abbot of San Michele, and in 1765, Superior General of his Order for the space of five years during which he resided in Rome.
His monumental work, in the preparation of which he was assisted by his confrères, Anselmo Costadoni and Angelo Calogerà, is the Annales Camaldulenses ordinis S. Benedicti, ab anno 907 ad annum 1770 9 volumes folio (Venice, 1755–73).