The International Rugby Board (IRB) awarded the 2007 Under 19 Rugby World Championship to the Irish Rugby Football Union (IRFU) and the Ulster branch hosted it. The Tournament, which took place in Belfast, Northern Ireland from 4–21 April, was split into two divisions of twelve teams. Division A games took place in Belfast at Belfast Harlequins' Deramore Park, Ulster Rugby's Ravenhill Stadium, and Cooke RFC/Instonians' Shaw's Bridge complex. Division B games were held in Queen's University of Belfast's The Dub complex and Malone RFC's Gibson Park in Belfast, and Bangor RFC's Upritchard Park in Bangor.
The Wales national Under 20 rugby team is for Welsh rugby union players aged 20 or under on 1 January of the year during which they are selected.
The World Rugby Under 20 Championship is an international rugby union competition. The event is organised by the sport's governing body, World Rugby, and is contested by 12 men's junior national teams with an under-20 age requirement. This event replaced the IRB's former age-grade world championships, the Under 19 and Under 21 World Championships.
The 2008 IRB Junior World Championship was the first annual international rugby union competition for Under 20 national teams. All players who were twenty years of age or under on 1 January 2008 were eligible for selection.
The England Under 20 rugby team are the newest representative rugby union team from England. They replace the two former age grade teams Under 19s and Under 21s. They compete in the annual Six Nations Under 20s Championship and World Rugby Under 20 Championship.
The Canada under 20 rugby team is the junior national rugby union team from Canada. It replaced the two former age grade teams, the under 19s and under 21s, in 2008. The team competed at the IRB Junior World Championship in 2008 and 2009 but were relegated to the IRB Junior World Rugby Trophy for 2010. The team has yet to make their way back to the top competition.
The South Africa national under-20 rugby union team are South Africa's junior team at national level. They have been competing in the World Rugby Under 20 Championship since its inception in 2008. This Under-20 tournament replaced the previously-held Under-19 and Under-21 Rugby World Championships. Prior to 2018, it had been the country's "next senior" (second-level) 15-man national side, but World Rugby no longer allows member unions to designate age-grade sides as "next senior" teams.
The United States national under-20 rugby union team, for sponsorship reasons known as the AIG Men's Junior All-Americans, is the United States' junior rugby team at the national level. The U-20 team has competed at the IRB Junior World Championship and at several IRB Junior World Rugby Trophy tournaments.
The Fiji national under 20 rugby team is for Fijian rugby union players aged 20 or under on January 1 of the year during which they are selected.
The 2013 IRB Junior World Championship was the sixth, IRB Junior World Championship, an annual international rugby union competition for Under 20 national teams. The event was organised in France by rugby's governing body, the IRB. A total of twelve nations played in the tournament. South Africa went into the tournament as defending champions, after winning the tournament for the first time in 2012. England were crowned the 2013 champions for the first time after defeating Wales 23–15 in the final on the 23 June at Stade de la Rabine in Vannes.
The Samoa under-20 rugby union team is Samoa's junior national team. They represent Samoa at the IRB Junior World Championship. After the 2010 Junior World Championship they were relegated to the Junior World Rugby Trophy for second tier nations. They were later promoted to the 2012 Junior World Championship after finishing as winners of the 2011 IRB Junior World Rugby Trophy. The team also competes at the Oceania U20 Championship as of 2015.
The Italy national under-20 rugby union team has competed in both the IRB Junior World Championship and IRB Junior World Rugby Trophy. They were one of four teams relegated in 2009 to the Junior World Trophy after finishing at the bottom of the tournament. They were again promoted to the 2011 IRB Junior World Championship after winning the 2010 IRB Junior World Rugby Trophy.
The 2013 IRB Junior World Rugby Trophy was the sixth IRB Junior World Rugby Trophy, an annual international rugby union competition for under-20 national teams, second-tier world championship.
The 2014 IRB Junior World Rugby Trophy was the seventh IRB Junior World Rugby Trophy, an annual international rugby union competition for Under-20 national teams, second-tier world championship.
The Uruguay under 20 rugby team is the junior national rugby union team from Uruguay. They replace the two former age grade teams Under 19s and Under 21s. The team competed at the World Rugby Under 20 Championships and World Rugby U20 Trophy.
The 2014 IRB Junior World Championship was the seventh annual international rugby union competition for Under 20 national teams. The event was organised in Auckland, New Zealand by rugby's governing body, World Rugby, then known as the International Rugby Board. A total of 12 nations took part in the tournament. England went into the tournament as defending champions, after winning the tournament for the first time in 2013. England went on to win the Championship for a second time in two years. While hosts New Zealand, the most successful team in the tournament, were looking to win the title for the first time since 2011.
The Romania national under-20 rugby union team is Romania's junior national team in rugby union. They have represented Romania in the IRB Junior World Rugby Trophy, now known as the World Rugby U20 Trophy but have not yet participate in the World Rugby U20 Championship. They participated in the first three Junior World Trophies, winning it in 2009, and in 2018 they hosted of the World Rugby U20 Trophy for the first time.
The Cook Islands national Under 20 rugby team is for Cook Islands rugby union players aged 20 or under on January 1 of the year during which they are selected. The team has played at the World Rugby U20 Trophy and also competes at the Oceania U20 Championship.
The Papua New Guinea national under-20 rugby union team is for Papua New Guinean rugby union players aged 20 or under on January 1 of the year during which they are selected. The team has played at the World Rugby U20 Trophy and also competes at the Oceania U20 Championship as of 2015.
2024 World Rugby Under 20 Trophy 
Scotland (2024)
Japan (3 titles)
