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.

[2] His ecclesiastical career and preparation for the priesthood was interrupted by the Napoleonic Wars, and he was ordained in 1816.

In 1817 he was papal nuncio in Spain and became titular archbishop of Tyre.

This article about an Italian Catholic cardinal is a stub.