The IRB under-19 Rugby World Cup was the premier tournament for male rugby union players under the age of 19 organised by the sports governing body the International Rugby Board (IRB) annually from 2004 until 2007.

Both it and the Under 21 Rugby World Championship were replaced by the IRB Junior World Championship for under-20 players which started in 2008.

Each division was split into four pools (labeled A-D) of three according to their past performance.

Four points were awarded for a win, two for a draw, and none for a loss.

Similarly, other teams entered play-offs for positions 5-8 and 9-12.