The UCI Cyclo-cross World Championships – Mixed team relay is the annual world championship in the discipline of cyclo-cross for mixed sex and mixed age-category teams, organised by the world governing body, the Union Cycliste Internationale.

The winning team receives the rainbow jersey.

In the inaugural edition each team consisted of 4 riders.

Since 2023 each relay team consists of 6 riders: The riders must already be entered in their respective individual World Championships event.

The countries are free to choose the starting order of their riders.