| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Giovanni Spennazzi | |
| Bishop of Pienza | |
| Church: | Catholic Church |
| Term: | 1637–1658 |
| Predecessor: | Ippolito Borghese (bishop) |
| Successor: | Giacondo Turamini |
| Consecration: | 11 October 1637 |
| Consecrated By: | Alessandro Bichi |
| Birth Date: | 1597 |
| Birth Place: | Siena, Italy |
| Death Date: | 11 August 1658 |
Giovanni Spennazzi (1597–1658) was a Roman Catholic prelate who served as Bishop of Pienza (1637–1658).[1]
Giovanni Spennazzi was born in 1597 in Siena, Italy.[2] On 5 October 1637, he was appointed during the papacy of Pope Urban VIII as Bishop of Pienza.On 11 October 1637, he was consecrated bishop by Alessandro Bichi, Bishop of Carpentras, with Tommaso Carafa, Bishop Emeritus of Vulturara e Montecorvino, and Joseph-Marie de Suarès, Bishop of Vaison, serving as co-consecrators. He served as Bishop of Pienza until his death on 11 August 1658.