2008 UCI Mountain Bike & Trials World Championships

The 2008 UCI Mountain Bike & Trials World Championships were held in Val di Sole, Italy from 17 to 22 June 2008. The disciplines included were cross-country, downhill, four-cross, and trials. The event was the 19th edition of the UCI Mountain Bike World Championships and the 23rd edition of the UCI Trials World Championships.

Future three-time road world champion and seven-time Tour de France points classification winner Peter Sagan won the junior men's cross-country title.