Current season or competition: 2024 World Rugby Under 20 Trophy | |
 The trophy awarded, pictured in 2018 | |
| Sport | Rugby union |
|---|---|
| Inaugural season | 2008 |
| Number of teams | 8 |
| Holders |  Scotland (2024) |
| Most titles |  Japan (3 titles) |
| Related competition | World Rugby Under 20 Championship |
The World Rugby Under 20 Trophy (known as the IRB Junior World Rugby Trophy until 2014) is an international rugby union competition. The event is organised by the sport's governing body, World Rugby, and is contested by 8 men's junior national teams with an under-20 age requirement. This event replaced the World Rugby's former age-grade world championships, the Under-19 and Under-21 World Championships.
The inaugural tournament was held in June 2008, hosted by Chile and with 8 teams participating.
The World Rugby Under 20 Trophy is the second level of the World Rugby tournament structure for under-20 national sides. At the same time that the Trophy was launched, World Rugby (then known as the International Rugby Board) also launched an upper-level championship, featuring 16 teams in 2008 and 2009 and a reduced format for 12 teams from 2010 and onwards.
Promotion and relegation between the Trophy and the Championship is in place. The winner of the Trophy will play in next year's Championship, while the last placed team at the Championship will be relegated to the Trophy for the next year.