The 2021 FIBA U18 European Challengers were international basketball competitions which took place from 3 to 8 August 2021, replacing the cancelled 2021 FIBA U18 European Championship.

[1] The 2020 edition of FIBA U18 European Championship was to be held in Konya, Turkey but was postponed to 2021 due to COVID-19 pandemic.

Since the pandemic continued in 2021, the FIBA Europe decided to hold alternative format of competition to replace traditional format of U18 European Championship where 16 or more teams gather in one place.

The Group A tournament was played in Skopje, North Macedonia.

The Group B tournament was played in Tel Aviv, Israel.