The 2025 FIVB Volleyball Men's U21 World Championship was the 23rd edition of the FIVB Volleyball Men's U21 World Championship, contested by the men's national teams under the age of 21 of the members of the ' (FIVB), the sport's global governing body. It was held in Jiangmen Sports Center at Jiangmen, China from 21 to 31 August 2025.
Starting with this edition, the tournament was expanded to include 24 teams instead of 16 teams of previous editions, following a decision adopted by FIVB in June 2023.
Defending champions, Iran, claimed their third title after defeating Italy in the final. The United States defeated Czech Republic in the third-place match and clinched their first medal in the competition. Seyed Matin Hosseini of Iran was named the MVP of the tournament.
On 28 March 2024, FIVB opened the bidding process for member associations whose countries were interested in hosting one of the four Age Group World Championships in 2025 (i.e., U19 Boys' and Girls' World Championships and U21 Men's and Women's World Championships). The expression of interest of the member associations had to be submitted to FIVB by 30 April 2024, 18:00 CEST ().
On 10 September 2024, FIVB announced that China had been selected as the host for the 2024 Boys' U21 World Championship.
A total of 24 national teams qualified for the final tournament. In addition to the host team and the defending champions who qualified automatically, 20 other teams were qualified through five separate continental competitions which were required to held no later than 31 December 2024. Two remaining teams entered the tournament via the Men's U21 FIVB World Ranking (as of 31 December 2024) among the teams not yet qualified.
The slot allocation per confederation was set as follows:
The following 24 teams qualified for the tournament.
The draw for the pools composition will held on 4 December 2024 at the FIVB headquarters in Lausanne, Switzerland. The 24 participating teams will be split into four single round-robin pools of six with the host nations and the reigning world champions receiving the highest seeds. The rest of the qualified teams are seeded in a serpentine system based on their positions in the respective FIVB World Rankings.
Men's U21 FIVB World Ranking of each team as of 4 November 2024 are shown in brackets, except the hosts China who ranked 66th.
The draw procedure also followed the serpentine system and was as follows:
The pools composition after the draw was as follow:
In June 2023 during a three-day meeting in Punta Cana, Dominican Republic, the FIVB Board of Administration approved the proposal made by its Volleyball Council to increase the number of participating teams to 24 in its Age Group World Championships (U19 and U21 in both genders). Consequently, the distribution of quotas by confederation for the Women's U21 World Championship was modified regarding previous editions, ensuring one automatic quota for the defending champion and assigning two quotas based on the corresponding FIVB Age Group World Ranking.
The new competition formula was in line with the one adopted for the 2023 FIVB Volleyball Boys' U19 World Championship, which was also contested by 24 teams.
The ranking of teams in the preliminary round was established according the following criteria:
Each national team had to register a long-list roster with up to 25 players, which eventually had to be reduced to a final list of 12 players. Players born on or after 1 January 2005 were eligible to compete in the tournament.
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
<div style="overflow-x: auto; white-space: nowrap;">
</div>
The following individual awards was presented at the end of the tournament.
The statistics of leaders for each skill are recorded throughout the tournament.