Marco Giustiniani (1655–1735) was a Roman Catholic prelate who served as Bishop of Torcello (1692–1735).^[1]

Marco Giustiniani was born in Venice, Italy on 12 February 1655.^[1] He was ordained a deacon on 20 January 1692 and a priest on 27 January 1692.^[1] On 24 March 1692, he was appointed during the papacy of Pope Innocent XII as Bishop of Torcello.^[1] On 30 March 1692, he was consecrated bishop.^[1] He served as Bishop of Torcello until his death on 2 March 1735.^[1] While bishop, he was the principal co-consecrator of Francesco Andrea Grassi, Bishop of Caorle (1700) and Pietro Barbarigo, Patriarch of Venice (1706).^[1]

• Cheney, David M. "Diocese of Torcello (Turris)". Catholic-Hierarchy.org. Retrieved June 16, 2018. (for Chronology of Bishops) ^{[self-published]}
• Chow, Gabriel. "Titular Episcopal See of Torcello (Italy)". GCatholic.org. Retrieved June 16, 2018. (for Chronology of Bishops) ^{[self-published]}