| Ruben Knab | |
| Nationality: | Dutch |
| Birth Date: | 19 February 1988 |
| Birth Place: | Ede, Netherlands |
| Height: | 1.93 m |
| Weight: | 98 kg |
| Country: | Netherlands |
| Sport: | Rowing |
| Event: | Eight |
| Olympics: | London 2012 M4- Tokyo 2020 M8+ |
Ruben Knab (born 19 February 1988) is a Dutch representative two-time Olympian rower. He finished fifth in the coxless four at the 2012 Summer Olympics and again finished fifth and at Tokyo 2020 in Dutch heavyweight men's eight.
He won a medal at the 2019 World Rowing Championships.[1] At Tokyo 2020 the Dutch men's eight won their heat, then finished 5th in the A final for an overall fifth placing at the Olympic regatta.