| Tournament details | |
|---|---|
| Host nation |  Iran |
| Dates | 23–31 August |
| Teams | 16 |
| Venue(s) | 2 (in 1 host city) |
| Champions |  Poland (2nd title) |
| Official website | |
| [1] | |
The 2003 FIVB Volleyball Men's U21 World Championship was the 12th edition of the FIVB Volleyball Men's U21 World Championship. It was held in Tehran, Iran from August 23 to 31, 2003.