| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Gian Antonio Grassi | |
| Bishop of Faenza | |
| Church: | Catholic Church |
| Diocese: | Diocese of Faenza |
| Term: | 1585–1602 |
| Predecessor: | Annibale Grassi |
| Successor: | Gian Francesco Biandrate di San Giorgio Aldobrandini |
| Death Date: | 30 July 1602 |
| Death Place: | Faenza, Italy |
Gian Antonio Grassi (died 1602) was a Roman Catholic prelate who served as Bishop of Faenza (1585–1602).[1] [2]
On 18 March 1585, Gian Antonio Grassi was appointed during the papacy of Pope Gregory XIII as Bishop of Faenza.He served as Bishop of Faenza until his death on 30 July 1602.