Sjefke Janssen (28 October 1919 – 3 December 2014) was a Dutch professional road bicycle racer.

He is most known for his bronze medal in the Elite race of the 1947 UCI Road World Championships.

[1] After retiring, he became a cycling team-manager and owned a bicycle shop in Elsloo.

[3] At the time of his death, Janssen was the oldest living Dutch Tour de France racer.

[2] He was the father of Dutch Olympic team dressage coach Sjef Janssen.