The 2021 FIVB Volleyball Boys' U19 World Championship was the 17th edition of the FIVB Volleyball Boys' U19 World Championship, contested by the men's national teams under the age of 19 of the members of the FIVB, the sport's global governing body.

The tournament was held in Iran from 24 August to 2 September 2021.

[1] Italy were the defending champions, having won their second title in Tunisia.

A total of 20 teams will qualify for the final tournament.

[2] * Japan, South Korea, Chinese Taipei, United States and Puerto Rico withdrew from the competition.