Defending champion and top seed Australia began its title defence against Ireland on 5 April as part of a Round One double-header at Ravenhill that also included number three seed New Zealand against France.
The seedings of all teams in Division A and the top six teams in Division B were based on the final standings at the 2006 Tournament. Seeds 7 – 12 inclusive in Division B represented teams who had qualified for 2007 via regional tournaments and their seeding was drawn randomly. All 24 participating teams were confirmed in January 2007.
This was the final Under 19 World Championship. The IRB decided to fold its under-19 and under-21 world championships into a two-tiered under-20 tournament structure starting in 2008. The top tier, the IRB Junior World Championship, will feature 16 teams, while eight teams will compete in the second-tier IRB Junior World Trophy.
Qualification
The following 24 teams, shown by region, qualified for the 2007 Under 19 Rugby World Championship .
Sarah Corrigan the Australian match official created history when she took charge of the Division B match between Zimbabwe v Canada on 4 April 2007, becoming the first female to referee at an IRB 15-man tournament outside the Women's Rugby World Cup. (The first woman ever to officiate at any IRB tournament outside the Women's Rugby World Cup was American Dana Teagarden, who was referee for six matches at the 2007 USA Sevens, an event in the IRB Sevens World Series held in February 2007.)
Pool/standings
The IRB setting for this tournament was that the matches were to be played between two pools from which the top 8 teams qualified for the Quarter finals and the team that finished at the bottom of the Division A pool was to be relegated to the Division B.
Pool A played against Pool D
Pool B played against Pool C
Match points were awarded on the basis of 4 points for a Win, 2 points for a draw and 0 points for a Loss. Bonus points were awarded for teams scoring 4 tries or more and to losing teams who lost be 7 points or less.
* Japan was initially demoted to Division B and Italy promoted to Division A for future World Championships. However, with the creation of the IRB Junior World Championship, both teams competed in its inaugural edition in 2008. This event featured all teams from the 2007 Division A, plus Italy, Canada, the US, and Tonga.
# Zimbabwe, Chile, Romania, Russia, Chinese Taipei and the Cook Islands were initially relegated from Division B and had to enter regional competitions to qualify for future World Championships. This did not change with the creation of the Junior World Championship and IRB Junior World Trophy; Georgia and Uruguay were given automatic berths to the 2008 IRB Junior World Trophy, while remaining nations had to play in regional qualifying for the remaining six berths.
Ireland]] 
New Zealand
South Africa
Australia
Wales
