| Sjaak Köhler | |
| Fullname: | Jakob Frederik Köhler |
| Birth Date: | 2 October 1902 |
| Birth Place: | Amsterdam, the Netherlands |
| Death Date: | 19 June 1970 (aged 67) |
| Death Place: | Amsterdam, the Netherlands |
| Sport: | Water polo, swimming |
| Club: | Het Y, Amsterdam |
Jakob Frederik "Sjaak" Köhler (2 October 1902 – 19 June 1970) was a Dutch water polo player and swimmer. He finished in seventh and fifth place with the Dutch water polo team at the 1924 and 1928 Olympics;[1] at both Games he played three matches and scored four and two goals, respectively. In 1924 he also competed in two freestyle swimming events (400 m and 4×200 m relay), but failed to reach the finals. His cousin Koos played water polo alongside Sjaak at the 1928 Olympics.