| Honorific-Prefix: | Most Reverend |
| Baldassarre Giustiniani | |
| Bishop of Venosa | |
| Church: | Catholic Church |
| Diocese: | Diocese of Venosa |
| Term: | 1572–1584 |
| Predecessor: | Giovanni Antonio Locatelli |
| Successor: | Giovanni Tommaso Sanfelice |
| Consecration: | 13 April 1572 |
| Consecrated By: | Archangelo de' Bianchi |
| Death Date: | 13 March 1584 |
| Death Place: | Venosa, Italy |
Baldassarre Giustiniani (died 13 March 1584) was a Roman Catholic prelate who served as Bishop of Venosa (1572–1584).[1]
On 6 February 1572, Baldassarre Giustiniani was appointed during the papacy of Pope Pius V as Bishop of Venosa.[2] On 13 April 1572, he was consecrated bishop by Archangelo de' Bianchi, Bishop of Teano, with Bartolomeo Ferro, Bishop of Terni, and Vincenzo Ercolano, Bishop of Sarno, serving as co-consecrators. He served as Bishop of Venosa until his death on 13 March 1584.