Marco Giustiniani
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), see Roman Catholic Diocese of Crete
- Marco Giustiniani (died 1438), Venetian governor
- Marco Giustiniani (1549–1581), Venetian governor
- Marco Giustiniani (bishop of Chios)
- Marco Giustiniani (bishop of Verona)
- Marco Giustiniani (bishop of Torcello)