2021 World Athletics U20 Championships
| Host city | Nairobi, Kenya |
|---|---|
| Nations | 116 National Associations |
| Athletes | 958 |
| Events | 45 |
| Dates | 18–22 August 2021 |
| Opened by | Uhuru Kenyatta |
| Main venue | Moi International Sports Center, Kasarani |
The 2021 World Athletics U20 Championships, also known as the World Junior Championships, was an international athletics competition for athletes qualifying as juniors (born no earlier than 1 January 2002), which was held from 18 to 22 August 2021 at the Moi International Sports Centre in Nairobi, Kenya.