The 16 boys' teams below qualified for the 2021 ITF World Junior Tennis Finals after all (with the exception of the host nation) won through regional qualifying events.
There are five qualification zones: Africa, North/Central America, South America, Europe and Asia/Oceania. In the larger zones there are two rounds of qualification to progress through to the Final.
The 16 boys' and girls' teams in the Finals are drawn into four round-robin groups, before the top teams in each group progress to the semi-finals where a knock-out competition decides the champions.