The 2005-06 World Sevens Series was the seventh in an annual series of rugby union sevens tournaments run by the International Rugby Board since 1999-2000. The participating teams in each World Sevens Series are full national sides. The series was won by Fiji. The tournaments spanned the globe, with the following events included in the 2005-06 tour: The most famous Sevens event, the Hong Kong Sevens, returned to the series after a one-year hiatus in 2004-05 for the IRB Rugby World Cup Sevens, which was held in Hong Kong in March 2005 and won by Fiji.