Marcel Janssens (30 December 1931, in Edegem – 29 July 1992, in Nukerke) was a Belgian professional road bicycle racer.

Janssens won two stages in the Tour de France, and finished 2nd place in 1957 after Jacques Anquetil.

He also won the 1960 edition of Bordeaux–Paris.

He finished third place in the 1959 Paris–Roubaix.

This biographical article related to a Belgian cyclist born in the 1930s is a stub.