- Category : 1881-births
- Type : GP
- Profile : 5/1 - Heretical / Investigator
- Definition : Single
- Incarnation Cross : LAX Cycles 1
Dutch gymnast who competed in the 1908 Summer Olympics.
Janssen was part of the Dutch gymnastics team, which finished seventh in the team event. In the individual all-around competition he finished 69th.
He was the younger brother of Jan Janssen. He died on 22 November 1986 at the age of 105 in Haarlem.