Giacomo Giustiniani (1769–1843) was an Italian priest, papal diplomat and Cardinal. Considered papabile in the Papal Conclave (1830–31), his election was vetoed by Ferdinand VII of Spain.
- Occupation
- Catholic priest, Catholic bishop
- Position held
- apostolic Nuncio to Spain, protonotary apostolic, titular archbishop, archbishop ad personam
- Born
- December 20, 1769
- Died
- February 24, 1843
