| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Giovanni Battista Desio | |
| Bishop of Venosa | |
| Church: | Catholic Church |
| Term: | 1674–1677 |
| Predecessor: | Giacinto Tarugi |
| Successor: | Francesco Maria Neri |
| Ordination: | 8 April 1651 |
| Consecration: | 16 May 1674 |
| Consecrated By: | Giulio Spinola |
| Birth Date: | 28 April 1628 |
| Death Date: | August 1677 (age 49) |
| Death Place: | Venosa, Italy |
Giovanni Battista Desio (1628–1677) was a Roman Catholic prelate who served as Bishop of Venosa (1674–1677).[1]
Giovanni Battista Desio was born in Naples, Italy on 28 April 1628 and ordained a priest on 8 April 1651.[2]
On 28 April 1628, he was appointed Bishop of Venosa by Pope Urban VIII. On 16 May 1674, he was consecrated bishop by Giulio Spinola, Bishop of Nepi e Sutri, with Giacomo de Angelis, formerly Archbishop of Urbino, and Pier Antonio Capobianco, formerly Bishop of Lacedonia, serving as co-consecrators.
He served as Bishop of Venosa until his death in August 1677.