Marcel Willemsen (born 28 May 1977 in Lochem, Gelderland) is a Dutch sidecarcross passenger and 1999 World Champion.

After this, he left his brothers team and started racing as a sidecarcross driver himself, competing in the Dutch and the world championship.

Marcel suffered serious injuries in a training run in February 2000, finding himself temporarily paralysed and unable to continue racing.

[2] He made a surprising recovery within ten months and returned to the sidecarcross world championship in 2001, now as a driver, with his countryman Rene Boon as passenger.

The 2008 season, now with his German passenger Marco Godau, was to be his last as an international rider, but he may continue to race in the Dutch championship were his showings have been much stronger over the years.