The 2018 World U20 Championships in Athletics, also known as the World Junior Championships, was an international athletics competition for athletes qualifying as juniors (born no earlier than 1 January 1999) which was held at Tampere Stadium in Tampere, Finland on 10–15 July 2018.[1] The championships were originally awarded to Tampere by the IAAF in March, 2016.[2]
The following is a list of participating nations with the number of qualified athletes in brackets. A country without any qualified athlete could enter either one male or one female.[4] A total 156 countries (plus the teams from Authorized Neutral Athletes and Athlete Refugee team) and 1462 athletes were scheduled to compete.[citation needed]