| Sport | Rugby union |
|---|---|
| Instituted | 2002 |
| Ceased | 2006 |
| Regional | International (World Rugby) |
| Holders |  New Zealand (2006) |
| Most titles | New Zealand (2 titles) |
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The IRB Under 21 Rugby World Cup was the premier tournament for male rugby union players under the age of 21, organised by the sports governing body the International Rugby Board (IRB) annually from 2002 through 2006. Both it and the Under 19 Rugby World Championship were replaced by the IRB Junior World Championship for under-20 players beginning in 2008.