UCI Junior Track World Championships

The UCI Junior Track Cycling World Championships (formerly named the UCI Juniors Track World Championships before 2016) are a set of world championship events for junior riders, for the various disciplines and distances in track cycling and are regulated by the Union Cycliste Internationale (UCI). In the period 2005–2009 the championships were part of the UCI Juniors World Championships.

Current events include: time trial, keirin, individual pursuit, team pursuit, points race, scratch race, sprint, team sprint, omnium and, for men only, madison. Women's events are shorter than men's.

Championships are open to riders selected by their national cycling association. They compete in the colours of their country.

The UCI awards a gold medal and a rainbow jersey to the winner and silver and bronze medals to the second and third. World champions wear their rainbow jersey until the following year's championship, but they may wear it only in the type of event in which they won it. Former champions can wear rainbow cuffs to their everyday jerseys.

World track championships are allocated to different countries each year. They are run by that country's national cycling association, although the judges are provided by the UCI.