The UCI Cyclo-cross World Championships – Junior Men's Cyclo-cross is the annual world championship for in the discipline of cyclo-cross for men in the Junior category, organised by the world governing body, the Union Cycliste Internationale.

The winner has the right to wear the rainbow jersey for a full year when competing in Junior cyclo-cross events.

Czechoslovakia peacefully split up in Slovakia and Czech Republic in 1993, they are all counted separately following the IOC's example.

See also talk page.