Junior is a category of athletics in which athletes compete under the age of 20 years. Countries all around the world compete in athletics. World Junior Athletics Competitions are held every two years which contain the best junior competitors in the world.

The principle behind the category is to introduce young people into athletics. Participators in the competitions in this class may be athletes who have not completed their twentieth birthday on 31 December of the year the competition occurs.^[1]

• List of world under-20 records in athletics
• International Association of Athletics Federations
• European Athletic Association
• Under-18 athletics
• Under-23 athletics