The 2017 IAAF World U18 Championships was the tenth and last edition of the biennial international athletics competition for youth (under-18) athletes.

[1] The five-day competition took place between 12 and 16 July at the Moi International Sports Centre in Nairobi, Kenya.

[2] Eligible athletes were aged 16 or 17 on 31 December 2017 (born in 2000 or 2001).

The United States, Great Britain, Australia, New Zealand, Canada, Japan, South Korea and Italy decided not to take part in the championships for organizational, logistical, and health and safety reasons (concerning athletes still underage).

Host nation ^[1] Independent Athletes were not included in the official medal table.