** Cuba was forced to withdraw from the competition due to COVID-19 infections and was replaced by Puerto Rico.

Teams were seeded in the first two positions of each pool following the serpentine system according to their FIVB U20 World Ranking as of 1 March 2021.

[5] FIVB reserved the right to seed the hosts as head of pools A and B regardless of the U20 World Ranking.

Netherlands (Hosts) Belgium (Hosts) Turkey (1) Italy (3) Russia (4) Poland (5) Serbia (6) Brazil (7) United States (9) Belarus (10) Argentina (12) Dominican Republic (15) Cuba (16)* Egypt (17) Rwanda (18) Thailand (44) * Cuba withdrew due to COVID-19 concerns and was replaced by Puerto Rico.

[7] ** The teams changed their groups after the draw because a policy about immigration of Belgium ban the people from Argentina, Brazil and Russia.