| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Giantommaso Gastaldi | |
| Bishop of Brugnato | |
| Church: | Catholic Church |
| Diocese: | Diocese of Brugnato |
| Term: | 1652–1655 |
| Predecessor: | Francesco Durazzi |
| Successor: | Giovanni Battista Paggi (bishop) |
| Consecration: | 1 September 1652 |
| Consecrated By: | Fabio Chigi |
| Birth Date: | 1597 |
| Birth Place: | Alassio Albinganen, Italy |
| Death Date: | 1655 (age 58) |
| Death Place: | Brugnato, Italy |
Giantommaso Gastaldi, O.P. (1597–1655) was a Roman Catholic prelate who served as Bishop of Brugnato (1652–1655).[1]
Giantommaso Gastaldi was born in Alassio Albinganen, Italy in 1597 and ordained a priest in the Order of Preachers.[2] On 26 August 1652, he was appointed during the papacy of Pope Innocent X as Bishop of Brugnato.On 1 September 1652, he was consecrated bishop by Fabio Chigi, Cardinal-Priest of Santa Maria del Popolo, with Ranuccio Scotti Douglas, Bishop Emeritus of Borgo San Donnino, and Carlo Carafa della Spina, Bishop of Aversa, serving as co-consecrators. He served as Bishop of Brugnato until his death in 1655.