| Birth Date: | 17 August 1937 |
| Birth Place: | Malang, Indonesia |
| Death Place: | Haren, Netherlands |
| Height: | 1.91m (06.27feet) |
| Weight: | 84kg (185lb) |
| Sport: | Swimming |
| Club: | DZV, Delft |
| Show-Medals: | yes |
Gerrit Jacobus Korteweg (17 August 1937 – 3 July 2022[1]) was a retired Dutch swimmer. He competed at the 1960 Summer Olympics in and 4×100 m medley relay and finished eighth in the latter event. In the 200 m butterfly, he finished sixth.[2]