| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Giovanni Tommaso Malloni | |
| Bishop of Belluno | |
| Church: | Catholic Church |
| Diocese: | Diocese of Belluno |
| Term: | 1634–1649 |
| Predecessor: | Giovanni Delfino |
| Successor: | Giulio Berlendi |
| Consecration: | 13 June 1628 |
| Consecrated By: | Antonio Marcello Barberini |
| Birth Date: | 1579 |
| Birth Place: | Vicenza, Italy |
| Death Date: | 7 February 1649 (age 70) |
| Death Place: | Belluno, Italy |
| Previous Post: | Bishop of Šibenik (1634–1649) |
| Nationality: | Italian |
Giovanni Tommaso Malloni, C.R.S. or Giovanni Tommaso Mallono (1579 – 7 February 1649) was a Roman Catholic prelate who served as Bishop of Belluno (1634–1649) and Bishop of Šibenik (1628–1634).[1]
Giovanni Tommaso Malloni was born in Vicenza, Italy and ordained a priest in the Ordo Clericorum Regularium a Somascha.[2] On 5 June 1628, he was appointed during the papacy of Pope Urban VIII as Bishop of Šibenik.On 13 June 1628, he was consecrated bishop by Antonio Marcello Barberini, Bishop of Senigallia with Lorenzo Azzolini, Bishop of Ripatransone, and Tiberio Cenci, Bishop of Jesi, serving as co-consecrators. On 26 June 1634, he was appointed during the papacy of Pope Urban VIII as Bishop of Belluno.He served as Bishop of Belluno until his death on 7 February 1649.