The 2026 World Athletics U20 Championships, also known colloquially by its former official title, the World Junior Championships, will be an international athletics competition for athletes qualifying as juniors (born no earlier than 1 January 2007. The event is due to be staged in Eugene, Oregon, United States from 5 to 9 August 2026. On 14 August 2023 it was announced that the city as a host of the 2026 World Athletics U20 Championships.
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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. A total 114 National Associations (plus the teams from Authorized Neutral Athletes and Athlete Refugee Team) and 897 athletes are scheduled to compete.