Marco Giustiniani or Marco Giustinian may refer to:
Marco Giustiniani (died 1277), Venetian diplomat, see Byzantine–Venetian treaty of 1277 Marco Giustiniani (1301–1346), Venetian diplomat took part in the Siege of Zadar (1345–1346) Marco Giustiniani (fl. 1341–1378), Venetian diplomat Marco Giustiniani (archbishop of Candia) (1392–1405), see Roman Catholic Diocese of Crete Marco Giustiniani (died 1438), Venetian governor Marco Giustiniani (1549–1581), Venetian governor Marco Giustiniani (bishop of Chios) (1547–1640) Marco Giustiniani (bishop of Verona) (died 1649) Marco Giustiniani (bishop of Torcello) (1655–1735)