The women's 400 metre freestyle competition at the 2006 Pan Pacific Swimming Championships took place on August 17 at the Saanich Commonwealth Place.

[1][2][3] The last champion was Diana Munz of US.

[4] This race consisted of eight lengths of the pool, with all eight being in the freestyle stroke.

[5] Prior to this competition, the existing world and Pan Pacific records were as follows: All times are in minutes and seconds.

The first round was held on August 19, at 10:00.