| Type: | Bishop |
| Honorific-Prefix: | Most Reverend |
| Giovanni Battista Lomellino | |
| Bishop of Isernia | |
| Church: | Catholic Church |
| Diocese: | Diocese of Isernia |
| Term: | 1567–1599 |
| Predecessor: | Antonio Numai |
| Successor: | Paolo De Curtis |
| Death Date: | 22 November 1599 |
| Death Place: | Isernia, Italy |
| Previous Post: | Bishop of Guardialfiera (1562–1567) |
Giovanni Battista Lomellino (died 1599) was a Roman Catholic prelate who served as Bishop of Isernia (1567–1599)[1] and Bishop of Guardialfiera (1562–1567).[2]
On 17 April 1562, Giovanni Battista Lomellino was appointed during the papacy of Pope Pius IV as Bishop of Guardialfiera.[3] [4] On 17 March 1567, he was appointed during the papacy of Pope Pius V as Bishop of Isernia.)He served as Bishop of Isernia until his death on 22 November 1599.