| Gunnar Grantz | |
| Birth Date: | 27 January 1885 |
| Nationality: | Norwegian |
| Sport: | Rowing |
| Club: | Christiania RK |
Gunnar Huseland Grantz (27 January 1885 – 8 February 1941) was a Norwegian rower who competed for Christiania Roklub.[1] He competed in the eight and in the coxed four, inriggers at the 1912 Summer Olympics in Stockholm. He died in the United States.[2]