| UCI Cyclo-cross World Championships – Men's junior race | |
| Date: | End of January, beginning of February |
| Discipline: | Cyclo-cross |
| Type: | One-day |
| Organiser: | UCI |
| Number: | 45 (as of 2024) |
| Mostwins: | , 2 wins |
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.