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 two top teams in the final standings met in the grand final match, with the first ranking team awarded home advantage.

Classification:Teams standings are calculated as follows:Most log points accumulated from all matchesMost log points accumulated in matches between tied teamsHighest difference between points scored for and against accumulated from all matchesMost points scored accumulated from all matches