This article shows the rosters of all participating teams at the 2019 FIVB Volleyball Men's U21 World Championship in Bahrain.
[2] Head coach: Giovane Gávio The following is the Bahraini roster in the 2019 FIVB Volleyball Men's U21 World Championship.
[4] Head coach: João Paulo Bravo The following is the Chinese roster in the 2019 FIVB Volleyball Men's U21 World Championship.
[10] Head coach: Monica Cresta The following is the South Korean roster in the 2019 FIVB Volleyball Men's U21 World Championship.
[13] Head coach: Michał Bąkiewicz The following is the Puerto Rican roster in the 2019 FIVB Volleyball Men's U21 World Championship.