| Order: | 162nd Doge of the Republic of Genoa |
| Term Start1: | 7 June 1752 |
| Term End1: | 7 June 1754 |
| Predecessor1: | Stefano Lomellini |
| Successor1: | Gian Giacomo Veneroso |
| Birth Date: | 1673 |
| Birth Place: | Genoa, Republic of Genoa |
| Death Date: | 1757 |
| Death Place: | Genoa, Republic of Genoa |
Giovanni Battista Grimaldi (1673 in Genoa – 1757 in Genoa) was the 162nd Doge of the Republic of Genoa.
On 7 June 1752, the day of the abdication of Doge Stefano Lomellini, Grimaldi was elected by the Grand Council of the Republic as his successor, the seventeenth in biennial succession and the one hundred and sixty-second in republican history. In the Dogate he had to face two important internal issues, in the island of Corsica to counter the arrogance of the Marquis of Coursai and in the western Liguria where there were several anti-Genoese protests, with an indirect but "interested" involvement of the nearby Kingdom of Sardinia. He ceased office on 7 June 1754 and died in Genoa during 1757.[1]