The IRB Pacific Rugby Cup 2009 was the fourth edition of the Pacific Rugby Cup competition. First held in 2006, the 2009 edition, like its predecessors, featured 6 representative rugby union football teams; 2 from each of the three Pacific rugby unions - Fiji, Samoa and Tonga.
Fiji Warriors won the championship, defeating Upolu Samoa in the final.
The 6 participating teams were:
The teams played a single round robin (home or away) series. The two top teams in the final standings met in the grand final match, with the first ranking team awarded home advantage.