| Round: | Assen |
| Flag: | Netherlands |
| Location: | Assen |
| Course Km: | 4.555 |
| Sbk Round No: | 4 |
| Sbk Season No: | 14 |
| Ss Round No: | 4 |
| Ss Season No: | 14 |
| Prev: | Spain |
| Next: | Italy |
| Date: | April 26 |
| Year: | 2009 |
| Pole Rider Sbk: | Ben Spies |
| Pole Rider Sbk Country: | USA |
| Pole Time Sbk: | 1:37.626 |
| Fast1 Rider Sbk: | Leon Haslam |
| Fast1 Rider Sbk Country: | UK |
| Fast1 Time Sbk: | 1:38.730 |
| Fast2 Rider Sbk: | Noriyuki Haga |
| Fast2 Rider Sbk Country: | Japan |
| Fast2 Time Sbk: | 1:38.680 |
| Pole Rider Ss: | Cal Crutchlow |
| Pole Rider Ss Country: | UK |
| Pole Time Ss: | 1:40.313 |
| Fast Rider Ss: | Cal Crutchlow |
| Fast Rider Ss Country: | UK |
| Fast Time Ss: | 1:40.836 |
The 2009 Assen Superbike World Championship round will be the fourth round of the 2009 Superbike World Championship season. It took place on the weekend of April 24 - 26, 2009 at the TT Circuit Assen located in Assen, Netherlands.
Roland Resch
