2008–09 in men's cyclo-cross covers the major Cyclo-cross competitions in the 2008–09 season, which runs from September 2008 until March 2009.
The competitions considered are the World Championships, National championships, the World Cup, the Superprestige and the Gazet van Antwerpen Trophy.
Results of single day races of type C1 (the highest class) are also given.